It has absolutely nothing to do with how your image appears on your screen. Just to prove there's nothing up my sleeve, let's change the resolution value of the photo from 72 to, oh, let's make it , which will mean that for every inch of paper when we go to print our image, of our image's pixels will be printed from left to right and again from top to bottom. You can see the change in the screenshot below:.
Now, since of our image's pixels from left to right are going to be fitting inside every inch of paper as opposed to only 72 pixels, it stands to reason that it's not going to take 48 inches of paper to fit the entire width of our photo into. Likewise, since of our pixels from top to bottom are going to be fitting inside every inch of paper as opposed to only 72 pixels, it shouldn't still take 32 inches of paper to fit the entire height into.
Just for fun, let's do the simple math ourselves. Once again, all we need to do is divide the width in pixels and the height in pixels by the resolution in pixels. According to my math, when I take pixels wide and divide them by pixels per inch, that gives me Likewise, pixels high divided by pixels per inch gives me 7.
In other words, when I take my photo that's pixels wide by pixels high and print it at a resolution of pixels per inch, my photo will be Let's take a look at what the Document Size section is telling us. Am I right? Looks like my math skills are stronger than ever okay, so I used a calculator.
Photoshop is showing us exactly what we expected, that at a resolution of pixels per inch, it will take To summarize then, all "image resolution" means is how many of your image's pixels will print inside every inch of paper. Again, it has no effect at all on how your image appears on your screen, since your monitor has nothing to do with your printer. There's one other aspect that image resolution has to do with, and that's the size of the pixels when you go to print the image.
It makes sense, really. An inch is an inch is an inch. The size of an inch is always the same. It's, well, one inch. So, since the size of an inch can't change, the size of the pixels has to change.
For example, in order to fit pixels into an inch, you would need pixels that are considerably smaller than if you only wanted to fit 72 pixels into an inch. Sort of like how, if you wanted to fit 10 people into a phone booth, you'd need people who were considerably smaller than if you only wanted to fit 3 people in there.
Fortunately, you don't need to worry about that. Photoshop takes care of resizing the pixels for us. Your email address will not be published. This is a Pixel dramatically enlarged for sake of explanation. There is a reason Space Invaders looks like this.
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They both have to do with pixels. A digital photo is not one non-dividable thing. The amount of these pixels and the way they are distributed are the two factors that you need to consider to understand resolution. The first kind of resolution refers to the pixel count which is the number of pixels that form your photo. In order to calculate this resolution you just use the same formula you would use for the area of any rectangle; multiply the length by the height.
For example, if you have a photo that has 4, pixels on the horizontal side, and 3, on the vertical size it gives you a total of 13,, Because this number is very unpractical to use, you can just divide it by a million to convert it into megapixels. The other kind of resolution is about how you distribute the total amount of pixels that you have, which is commonly referred as pixel density.
Now, the resolution is expressed in dpi or ppi , which is the acronym for dots or pixels per inch. So, if you see 72 dpi it means that the image will have 72 pixels per inch; if you see dpi means pixels per inch, and so on. The final size of your image depends on the resolution that you choose.
If an image is x pixels it means that it will print at 15 x 10 inches if you set the resolution to dpi, but it will be Basic Terminology. Key Concepts digital images resolution pixel dimensions bit depth dynamic range file size compression file formats additional reading. The pixel dimensions may be determined by multiplying both the width and the height by the dpi.
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