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How Windows' DPI setting affects Capture or Drawing program measurements?

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christina_a
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How Windows' DPI setting affects Capture or Drawing program measurements?

If I change from Windows default of 96 DPI to 110, does that affect the displayed pixel size of say, a selected area in a screen capture or drawing?
Like in PicPick or Paint.net?

I can't determine exactly how changing Windows' system DPI setting to a non-default value affects the displayed sizes of objects in screen capture or image editing programs.

(1) I've noticed if I take a screen capture (or add objects to a drawing, capture), save it, then look at it in Firefox, the image (or size of fonts on that capture, etc.), appears noticeably larger when viewing the saved capture copy in Firefox than when viewing it in the original apps that made it or were used to edit it.

(2) Another example: Certain "browser characteristic" info sites may show the "screen size" of browsers. Browser screen size is not the same as (monitor) display size. Normally, browser screen size is the part of a browser window available to display text, images.

If I take a screen of the browser screen, then use the selection tool in any editing program I've tested, I've never gotten the measurements (in an image editing program) to match what the info site shows. Close, but not close enough.
I've also tried correcting the size the size using ratios of Windows' default DPI (96): current DPI setting. That may get my measured browser screen size closer to what info sites show, but still not close enough.

Differences in my measured browser screen size (of screen captures) & those of info sites are not from including / excluding browser borders, etc. I've tried it *many* ways.

The results from (1) & (2) may show that the browser displays images a different size than the original editing / capture program; and / or changing Windows DPI affects displayed image sizes differently, depending on what's used to view them.

There are other reasons besides discrepancies with a browser characteristic site that I'd like to know the "real" size of selected areas or objects in image editors. And how Windows' DPI setting affects editors' reported pixel sizes, if at all.