Photographing is a creative process. No wonder it is elevated to the rank of art. Well-known photographers arrange exhibitions along with artists. Good pictures are valued and can generate income.
Photography has long been part of our daily lives. Instead of memorizing a schedule or a phone number, it's easier to take a picture with your phone's built-in camera. The way photographs are stored has also changed: many do not print photos, but store them in electronic format. At any time, pictures can be viewed or sent to friends. But the technology is improving, and the possibilities of using images are becoming almost limitless. This applies to both the commercial sector and private photo shoots. All new photo formats appear and now you can print a picture in any size, after cropping it.
Photo formats for printing
Despite the development of digital photography, printed images do not lose their popularity. For example, photos for documents, as before, are required on paper. Paper banners and posters hang on the street. You can print photos literally on any surface - on a T-shirt, mug, your smartphone case. Taking a photo is not a problem. It is important to choose the correct photo sizes for on-site printing. Even if you manage to get a perfect photo, it may not be suitable for printing.
Consider the main photo formats for printing.
Standard ISO formats
Formats that you most likely heard about in school. These are the same letters A with numbers. The table below lists the formats and their exact dimensions.
| ISO standard | Size (cm) |
|---|---|
| A1 | 59.4x84.1 |
| A2 | 42x59.4 |
| A3 | 29.7x42 |
| A4 | 21x29.7 |
| A5 | 14.8x21 |
| A6 | 10.5x14.8 |
It is worth paying attention to these parameters since office equipment is produced taking into account these values. For example, once beloved photos of 10x15 cm, in fact, are standard A6 with minor amendments.
Print formats are not limited by international photographic standards. There are also other photo sizes. Each photo workshop has a table that indicates the photo formats and their purpose. If you plan to print pictures at home, you can find a similar table on the Internet and refer to it when editing images before printing.
Document photo formats
Separately, it is worth talking about photographs for documents. Document image sizes are also standard. A specific document has its own image sizes. The largest photos are needed for personal files (9x12), the smallest ones for military tickets and driver's licenses (2.5x3.5).
square photos
There is a small group of specialized formats, such as square ones. Now photos in this format can be found mainly in social networks like Instagram. The most interesting example is the photographs taken with the help of Polaroid.
The most popular sizes for square photos are as follows:
Widescreen photos
With the development of technology, wide-format photographs are becoming more widespread, i.e. photographs whose length is many times greater than the height. They are notable for their resemblance to a panoramic image. For a long time, advertisers have had the opportunity to use a large-format plotter with a size of 10000x5000 to print banners, thus eliminating the need for composite compositions.
Why Consider Image Resolution?
Playing with the scale in the photo editor, you can get small pictures, or vice versa, you can increase the image in size. But there is a problem with the quality of the photo. It is not enough to choose a format for printing, you must take into account the resolution of the image. A digital image is made up of pixels. The number of dots per inch indicates the clarity of the image and is called resolution. The more dots, the clearer the photo will be when printed. For example, to get a picture that will be easy to process, a resolution of 300 dpi is enough. When printing on a sheet of 8x10 cm, in the editor you will get a size of 2400x3000 pixels.
Photo editing intricacies
If the image format is non-standard, then before printing it is better to use a photo editor and change the image resolution.
Also, if you want to print a small photo on a large format, the image will turn out to be fuzzy and blurry. Therefore, think in advance where the picture will be used.
Even an old photo can be printed on paper - you just need to set the format correctly. And to set the scale and aspect ratio correctly, use Movavi's simple and intuitive photo editor.
In Movavi Photo Editor, you can resize the resulting image in two ways:
1. Resize photo
- Click tab Size on the main toolbar
- Use ready-made profiles or set your own photo size:
- Enter values in block fit to size. Click on the icon keep proportions to scale proportions independently.
- Select a predefined profile.
- Click Other size to see all available profiles.
Crop your photo
- Go to tab pruning.
- Set the required size:
- Specify width And height in the respective fields.
- Select the appropriate profile from the list.
- Set the parameters yourself. Position the frame so that you are satisfied with the resulting picture. To resize the frame, simply drag its edges.
Content Topics
While you are scrolling through the photos from your vacation on the computer screen, you do not even think about the format in which they are made. However, if you decide to send them to print, you will need to choose the dimensions of the future photo, that is, adapt your pictures to standard photo paper sizes.
Today we will tell you how to do it correctly and determine the size of photos or pictures for printing.
Photo Size Chart for Printing
Standard photo sizes for printing are shown in the table:
| Photo standard | Size (pixels) | Exact size | Number |
|---|---|---|---|
| 9x13 | 1063x1535 | 8.90x12.70 | 1 |
| 10x15 | 1181x1772 | 10.20x15.20 | 2 |
| 13x18 | 1535x2126 | 12.70x17.80 | 3 |
| 15x20 | 1772x2362 | 15.20x20.30 | 4 |
| 15x21 | 1772x2362 | 15.20x21.60 | 5 |
| 15x22 | 1772x2480 | 15.20x22.80 | 6 |
| 15x30 | 1772x2598 | 15.20x30.00 | 7 |
| 15x38 | 1772x3543 | 15.20x38.10 | 8 |
| 15x45 | 1772x4488 | 15.20x45.70 | 9 |
| 18x24 | 1772x5315 | 17.80x24.00 | 10 |
| 18x25 | 2126x2835 | 17.80x25.40 | 11 |
| 20x25 | 2126x2953 | 20.30x25.40 | 12 |
| 20x30 | 2362x3543 | 20.30x30.50 | 13 |
| 25x38 | 2953x4488 | 25.40x38.10 | 14 |
| 30x40 | 3543x4724 | 30.50x40.60 | 15 |
| 30x45 | 3543x5315 | 30.50x45.70 | 16 |
| 30x90 | 3534x10630 | 30.50x91.40 | 17 |
To find out which inch sizes of photographs correspond to standard parameters, you just need to convert centimeters to inches by dividing them by 2.54 or use a special table.
Correspondence table for standard photo sizes in inches and pixels:
| Standard | Size (pixels) | Size (inches) |
|---|---|---|
| 9x13 | 1063x1535 | 3.5430x5.1170 |
| 10x15 | 1181x1772 | 3.9370x5.9070 |
| 13x18 | 1535x2126 | 5.1170x7.0870 |
| 15x20 | 1772x2362 | 5.9070x7.8730 |
| 15x21 | 1772x2362 | 5.9070x8.2670 |
| 15x22 | 1772x2480 | 5.9070x8.6600 |
| 15x30 | 1772x2598 | 5.9070x11.8100 |
| 15x38 | 1772x3543 | 5.9070x14.9600 |
| 15x45 | 1772x4488 | 5.9070x17.7170 |
| 18x24 | 1772x5315 | 7.0870x9.4500 |
| 18x25 | 2126x2835 | 7.0870x9.8430 |
| 20x25 | 2126x2953 | 7.0870x9.8430 |
| 20x30 | 2362x3543 | 7.8730x11.8100 |
| 25x38 | 2953x4488 | 9.8430x14.9600 |
| 30x40 | 3543x4724 | 11.8100x15.7470 |
| 30x45 | 3543x5315 | 11.8100x17.7170 |
| 30x90 | 3534x10630 | 11.8100x35.4330 |
Why do you need to know the size of photos for printing?
Previously, when we filmed our holidays and birthdays with "film" cameras, we took the "tube" with the film to a special workshop. There we noted the selected frames that needed to be printed, and then we took the finished order. And already at home they often found that the photos came out unsuccessful. It was almost impossible to see them on film.
Now, in the era of digital photography, it would seem that everything is much simpler, and before taking a flash drive with pictures for printing, we can thoroughly study them and choose the best ones. But, in fact, only those who have never printed frames from digital media think so.
The problem here is that such images can have any extension, as well as the ratio of horizontal and vertical sizes. In turn, as photo paper is produced within certain standard parameters. And if, for example, you took a wonderful square frame to the photo workshop, then when printing, the master, at his discretion, will “cut off” part of the photo in order to adapt it to the desired rectangular format. And not the fact that you will like how he did it.
It is in order to avoid such troubles that you need to know the exact dimensions of the photos, as well as how many pixels horizontally and vertically they correspond to.
You can get the necessary information by reading the special table provided above.
How to edit pictures?
You can easily edit your photos, change their frame, and also the size in the Paint program, which is on any computer. This graphics editor is easy to use and very convenient even for inexperienced users.
To process a photo, you must first right-click on the desired file, and then select the "open with" line from the menu, and then click on "Paint".
When the desired photo opens on your monitor, select the "resize" button in the upper right corner. The program will offer two options, one in percentage and the other in pixels, here you need to select the second one. After that, you just have to drive in the necessary parameters, and save the changes.
As a result, it turns out that in order for you to be exactly satisfied with the received paper pictures, you need not only to choose the best frames, but also process them correctly, “adapting” them to the standard sizes of photo paper sheets.
At all stages of creating a photo, you must choose the format for saving. Until the image is released to the public, it is saved 4 times:
- at the time of shooting on the camera's memory card;
- when converting from a memory card to a PC for editing;
- after editing to save to PC;
- to transfer photos to viewers - social networks, clients, photo stocks.
At each stage, the requirements for the image are different, as a result of which there is a great variety of formats. For example, the first task of the photographer will be to take the maximum information from the subject, that is, to save the largest number of data points. There should be a format with minimal compression and loss. At the last stage, especially for posting pictures on social networks and Instagram, the size and amount of information do not play a role at all. Here the main thing is the idea, colorfulness, execution, details. We need a format that compresses photos to miniature frame sizes without losing clarity and quality. To store photos on a PC, you need powerful archivers, masters of their craft, who do not kill quality during compression.
Most often, everything starts with RAW, and the output is saved in JPEG, at the moment, this option is the most popular. To decide on the required formats, you must first find out which ones exist today and how they differ from each other. This will allow you to choose the best option for each stage in the life of your photos.
What are graphic formats
To date, there are dozens of different formats for photography, among them are the most popular and most commonly used:
- RAW- a common name for all cameras, denoting a "raw" file, unprocessed. Each manufacturer has its own name and extension for this format. The most popular to date for filming.
- JPEG, JPG- the second most popular for saving frames in the process of filming, the frame "weighs" less, without much loss in quality, but there will be difficulties with post-processing. The format deprives the photographer of the opportunity to correct the picture in many ways. For storing and transferring photos, it is used more often than others many times over.
- TIFF- a great option for saving a large amount of information, compresses the frame almost losslessly, but the picture still "weighs" quite a lot. For a long photo session, you will need a lot of space and memory cards. The abbreviation stands for Tagged Image File Format, the format allows you to edit images in all respects.
- PNG- a format for storing and transmitting bitmap images without significant loss in quality. It was developed to extend the capabilities of the GIF format. PNG has a color depth of up to 48 bits, you can save only an object without a background. A great option for storing and editing pictures.
- GIF - compresses pictures well, but it is not suitable for working with large images or for editing pictures. A fairly simple format for transferring bitmap images with a color depth of no more than 8 bits. GIF supports animation, such moving pictures are often referred to as "gifs".
- PDF a great option for storing a number of images in one file. Photobooks, slides, photos from one photo session are saved in this format. A great helper for transferring offline images electronically. Developed by Adobe Systems to reproduce the image in original colors and without loss of appearance. Not suitable for photographers, especially for working with large images, almost impossible to edit.
- PSD created by Adobe Photoshop and is an editable file consisting of layers with all superimposed effects, masks, text. An excellent option for transferring and storing an image, if its further processing is implied.
In addition to those listed, there are more than a dozen different formats, most often highly specialized, sharpened for a specific task, not suitable for the work of a photographer.
Features of the JPEG format
The huge and main advantage of the JPEG format is its versatility - absolutely all editors and programs are able to read it. Saved pictures on the network or on a PC are no exception. This is the reason for its popularity, in 80% of cases the transfer of graphic data between users occurs using the JPEG format. Many photographers even use it for shooting when they need to significantly save time on saving a single frame and space on a memory card. But JPEG also has significant drawbacks, forcing you to choose RAW or TIFF.
Benefits of the JPEG format
The main task of the creators of the format was to compress the images to the optimal level without losing quality. Judging by the distribution of the image in jpeg, they succeeded. What are the main advantages of the format:
- Pictures are ready for printing or transfer immediately after shooting, they can be directly displayed on a PC screen, sent to a printer without conversion and viewed on the screen as they are;
- The “correct” colors will be displayed on the camera display, this is how the picture looks for the matrix, flaws can be changed during shooting;
- Manual camera settings allow you to select parameters during the shooting process - white balance, noise reduction, sharpness, saturation and contrast;
- The "weight" of pictures is much less, sometimes even 2-3 times, than when saving in RAW or TIFF;
- After shooting, you can open the file in almost any program for viewing or editing;
Cons of the JPEG format
But it is impossible to do without minuses or inconveniences in the digital world. There are also significant disadvantages:
- Post-processing of images is not possible for some parameters, if the sharpness, noise or balance does not match expectations, the photo will most likely go to trash;
- When saving a frame, some of the information is lost, the quality of the image in a large format will noticeably limp;
- Many pictures will lose sharpness when switching from RAW to JPEG, if the parameter is important, then it is better to choose another format.
JPEG significantly cuts off the possibilities of post-processing, which is an important and essential moment for a photographer. Therefore, many shoot in RAW, and save it as JPEG, but after editing. This order adds some difficulties, but brings excellent results.
Features of the RAW format
To clarify the terminology, RAW is not an extension, not a format, but a common name for formats that have the same essence and purpose - to save the maximum amount of information about each pixel. Each manufacturer named it differently. What are the advantages of this way of storing information:
- Saving additional information about each section of the image, if necessary, it can be pulled out and used for processing;
- Color correction capabilities at the highest level, in post-processing you can tighten the white balance, change the saturation or contrast of each color separately;
- Many editors allow you to save snapshot settings and apply them to multiple images;
- More options for applying additional effects, styling and artistic elements;
- High quality for large format printing, no dead pixels or data loss;
- Working with overexposed areas, editing shadows, dark details, removing noise, sharpening.
All the advantages of the RAW format are in the field of image editing, which is very important for photographers, but not essential for ordinary people. Thus, we can highlight the disadvantages of the format:
- The most important inconvenience is the need to convert images, without which you cannot even view the image in its normal form;
- The "weight" of each frame does not allow you to take thousands of photos quickly, and you will need a lot of space to store them;
- Converting images takes time and the availability of specialized programs, which significantly slows down the process of working with them.
All the shortcomings relate to the process of saving and using photos, which is very inconvenient for "non-specialists". Drawing a conclusion from the pros and cons, we can say that the RAW format is an option for professionals, for artistic processing and subsequent work with images.
To view photos at home or print them on a 10x15 cm format, JPEG will be enough. The same applies to the use of photos on social networks, where the use of RAW will only create a number of inconveniences.
10 reasons to shoot in RAW
Summing up the pros and cons of the two main popular formats, we can conclude that if you are a photographer, then the RAW format is more of a necessity than a habit or a whim. Some sources cite several reasons to opt for it:
What format to choose?
Comparing the main formats for saving graphic files, we can conclude that for different tasks you need to choose a separate format. Each has pros and cons, advantages and disadvantages.
- For shooting and saving frames in the camera's memory, RAW is definitely the best. But for time-lapse or fast shutter clicks, it’s better to lose a little in quality, but not to miss the main thing, JPEG will “save” here.
For editing and design - PSD, RAW, TIFF to choose from, as you like.
For storage on a PC - JPEG still confidently holds the palm, allows you to compactly fold pictures without losing quality. The same goes for saving photos to social media accounts. The JPEG format will suffice to the fullest.
For data transfer - JPEG, again, and GIF. They compress the image to an acceptable size without spoiling the image too much.
In what format to shoot and store is a purely personal matter, no one cancels a habit, priorities, personal preferences. For a real photographer and master, incorrect formats will not interfere with creating a masterpiece.
For a novice user, Photoshop will seem like a magical tool that can change any photo beyond recognition with mysterious ease. But how!? Tell! How he does it? What is the mechanism? What happens inside the photo, that it changes in any way, as if it were a chameleon? Yes, nothing complicated, you just need to know what digital photography consists of and what rules apply to it, then everything will fall into place.
Namely, Photoshop works with this type of graphics, it consists of tiny elements - pixels, like any object of the smallest particles - atoms.
Pixels- These are tiny square-shaped elements that contain information about color, brightness and transparency. The term comes from the crossing of two English words - picture (image) And element (element).
A digital image file consists of vertical and horizontal rows of pixels that fill its height and width, respectively. The more pixels an image contains, the more detail it can display. They are elusive to the human eye, because they are negligible. To see them, you have to greatly enlarge the image:
Pay attention to . The red frame marks the visible part of the image. I increased to 1200% the area where the panda's nose and mouth are depicted. As you can see, the image consists of a set of colored squares. When enlarged, it looks like a patchwork quilt of square fragments.
Looking closely, you can understand the basic principles of image construction:
1. Pixels are square in shape and line up in an image in the form of a grid (remember a squared notebook sheet).
2. Squares are always strictly one specific color, they can't even be a gradient. Even if it seems to you that some square is shimmering in color, then this is nothing more than an optical illusion. Enlarge this area even more and you will see it.
3. A smooth transition between colors occurs due to the gradually changing tones of adjacent pixels. Even the contact line of contrasting colors can contain more than a dozen tones.
Image Resolution
The concept of image resolution is inextricably linked with pixels.
The resolution of a digital photograph is written as follows: 1920×1280. This entry means that the image has 1920 pixels wide and 1280 pixels high, that is, these numbers are nothing more than the number of those very small squares in one row and column.
By the way, if you multiply these two numbers - 1920 × 1280 (in my example, you get 2,457,600 pixels), then we get the total number patchwork, which make up a particular image. This number can be reduced and written as 2.5 megapixels (MP). You came across such abbreviations when you got acquainted with the characteristics of a digital camera or, for example, a camera in a smartphone. Manufacturers of equipment indicate the maximum value that their product is capable of. This means that the higher the number of MPs, the greater the resolution of future images can be.
So, the higher the resolution, the smaller the pixels, which means that the quality and detail of the image increases. But a photo with a higher resolution will also weigh more - such is the price of quality. Since each pixel stores certain information, with an increase in their number, more computer memory is required, which means that their weight also increases. For example, a photo of bears at the top of an article at 655x510 is 58KB, while a photo at 5184x3456 is 6MB.
Pixel sizes and printing
It is important to distinguish between situations when we are talking about pixel sizes and their impact on photo quality.
Looking at the images on the monitor screen, we see that the pixel dimensions are always the same. The computer resolution size is 72 dpi.
Note
Please note that when you create a new document in Photoshop, the default program offers you exactly this value:
When viewing large photos on a computer, for example, 5184 × 3456, one feels how detailed it is, there is no graininess and no defects, it is bright and clear. But believe me, such a photo is again 72 dpi. Let's open the properties of the image for the sake of interest:
A large photo will look great on a computer due to the scale. What is your screen resolution? Obviously not 5184×3456, but less. So the computer must reduce such a photo so that it fits entirely on the computer screen. There is a compression of pixels and a decrease in their size, which means that this is a cool picture quality. If you were to view such a photo at its original size, you could easily see the blurring and fading of the image, as well as the sharp edges of the contrasting details.
Pixel dimensions are most often remembered when it comes to printing a photo. Here 72 points may not be enough.
For example, I created a 655x400 pixel document with a resolution of 72 pixels. Look at the graph print size:
Photoshop calculated that a 655x400 72 dot image could be printed on 9.097x5.556 inch paper (23.11x14.11 in centimeters)
655 pixels wide divided by 72 pixels per inch = 9.097 inches wide
400 pixels divided by 72 pixels per inch = 5.556 inches high
It would seem, “Wow! What a large sheet you can print on! But in fact, the photo will be something like this:
Blurry photo, no sharpness and clarity.
Printers are considered high-resolution devices, so in order for photos to be beautifully printed, you need to either print photos initially at a large size, like 5184x3456 for me, or change the number of dots per inch in the range from 200 to 300.
Again, I will also take the image 655 × 400, but I will change the number of points to 200, here is what Photoshop writes:
Reduced print size by almost three times. Our image now has 200 pixels printed on 1 inch of paper.
As it turns out, the image will be small, it will hardly fit into a standard 10 by 15 photo, but it will be of high quality, clear and detailed.
It turns out that there is a certain minimum resolution size for printing photos. If the picture is initially small in size, as I had, then there is nothing to even think about good print quality.
What size should an image be to print nicely?
Let's say you came from a vacation from the Crimea, or took 100,500 photos of a child and, of course, want to print something in a photo album (example 1), and make one of the most remarkable in the form of a picture on the wall (example 2). Let's see what size such photos should be and whether modern cameras can achieve this.
Example 1
So, as a rule, in the photo album there are photos of the size 10×15 cm(in inches this is 3.937×5.906). Now we will find out what the minimum size of a photo should be in order for everything to be printed beautifully. For calculations, we take a resolution of 200 dpi.
200 pixels per inch x 3.937 inches wide = 787 pixels;
200 pixels per inch x 5.906 inches high = 1181 pixels.
That is a photograph 10×15 cm = 787×1181 pixels, minimum (!)
And knowing the total number of pixels in this resolution (787 × 1181 = 929447 pixels), rounded to the nearest million, we get 1MP (megapixel). I already wrote that the number of megapixels is the most important characteristic of modern cameras. The average number of MP in cameras and smartphones reaches about 8 MP.
This means that the current technology will easily make it possible to take photographs suitable immediately for printing pictures in 10×15 cm.
Example 2
Now let's look at the case when you have chosen a photo and want to hang it on the wall in a frame measuring, say, 30 × 40 cm (I took the frame size from the IKEA store catalog), immediately convert it to inches: 11.811 × 15.748. For this photo size, I would take the maximum resolution: 300 dpi, this is already considered a professional and the highest quality print (just what you need for a large picture in a frame). And now the calculations:
300 pixels per inch x 11.811 inches wide = 3543 pixels;
300 pixels per inch x 15.748 inches high = 4724 pixels.
So your photo must be at least 3543x4724 pixels. We multiply the values and get 16.737.132 pixels or 17 MP!
Thus, to print a framed photo, you need a powerful camera. In this range are already considered. And this is an expensive and serious type of technology.
In general, you should now be at least a little clear about how the Photoshop program works and how all these photo editing frauds turn out. Having learned about pixels, their properties and capabilities, this process should no longer seem like magic.
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Basic terms for understanding the topic
PixelsSmall square dots, colored in a certain light, that make up a single whole - an image.
When you look at a photograph, the eye does not notice the specific dots of the raster, since they are very small and their number can reach tens of thousands, they merge to form one picture. Only when magnified can you see them.
There is a feature: the higher the number of raster dots, the more details are drawn and the photograph is better.
Linear dimensionis the width and height of the printed image, expressed in millimeters. They can be recognized using a regular ruler. For example, the linear size of a picture with parameters 10*15 cm is -102*152 mm.
Pixel parameters are data about the width and height of the digital image.
| Megapixels | Max. print format | Size in pixels |
| 3 | 13x18 | 1500x2102 |
| 6 | 15x22 | 1795x2646 |
| 8 | 20x30 | 2304x3456 |
| 10 | 20x30 | 2398x3602 |
| 12 | 24x30 | 2835x3602 |
| 16 | 30x40 | 3602x4760 |
| 24 | 30x45 | 3602x5398 |
Permission
A number that relates values in millimeters and in pixels, measured in dpi (from the English "dots per inch" - the number of dots per inch).
Experts advise to set the resolution - 300 dpi, designed to obtain high-quality photographs.
But, it is worth noting that if you make a photograph larger than the original, that is, “stretch the dots”, then the quality drops.
Standard sizes
What are the photo formats? Let's find out.
The most popular print size is 10*15 cm. It is used to form a family archive.
The next one is 15*20 cm or A5.
A4, 20 * 30 cm or 21 * 29.7 cm. Used to decorate walls with photographs. Since A4 is the size of office paper for printing, printing is not difficult, since most printers are designed for A4 production.
30*40 cm - complex format. It has two other names: A3 or A3 +. Why complex? Because there is confusion. A3 size has parameters 297*420 mm, but you cannot pick up such photo frames, they are not on sale. The closest photo frame to this photo is 30*40 cm. Be careful when ordering. Photo frames are made with glass.
Custom sizes
Often we have to order a photo not of a standard size, but of a unique one - non-standard.
13 * 18 cm. It is used extremely rarely.
30 * 45 cm, 40 * 50 cm, 40 * 60 or 60 * 90 Pictures with these parameters will help decorate the interior, since they are quite large. Therefore, the quality must be high.
How to calculate dimensions for high resolution
You can calculate the parameters in pixels, which will result in a resolution of 300 units or more.
Let's take a closer look at a photo with parameters of 10 * 15 cm.
The linear values of these parameters (usually indicated in special tables) are 102 * 152 mm.
Multiply the width of the image (102 mm) by the resolution we want to achieve, in our case it is 300 dpi.
Divide the result of the last step by the number of mm in one inch - 25.4.
Let's get the number of raster dots of the original image in width 102*300/25.4 =1205.
We will carry out the same algorithm for the height.
152*300/25,4 = 1795.
Photo printing "with borders" and "without borders"
When we accept an order for photo printing, we always ask about the method of printing - do you like it, “with margins” or “without margins”? It's about cropping photos.
Let's explain in more detail:
the most common paper size for printing - 10x15 cm has an aspect ratio of 2:3, and the aspect ratio of most modern digital cameras is 3:4. Therefore, when we try to print a "digital" photograph on 10x15 paper, two options are possible:
A) We fit the whole picture on paper without cropping anything - but due to the mismatch of proportions we get “white margins” on two sides (most often on the short sides) - this is called
"PRINTING WITH MARGINS"
