Why a jpg file size grows when I OPEN it in Photoshop before you do anything for her?

I open a jpg file which my trusty Mac tells me is 2.4 MB, but Photoshop has immediately 34.8 Mb in size of the image. It is a picture of 72 dpi which is 59,333 inches width x 39,556 inches in height. I want to REDUCE it to one 17 "(approx.) size 11" for printing, which allows Photoshop to increase the resolution. I UNCHECK resample, and enter a width of 17. I have 17 inches wide; 11,333 inches and a resolution of 251,294 inches. Great! What I don't understand, however, is that - without Photoshop add no matter what pixel (remember, I REDUCE the size of the photo without resampling) - the size of the file is more than 14 times larger. The same thing with each jpg Photoshop I opened: 129Kb photo opens in Photoshop to 482.6 Kb; a 1.2 MB file opens to 5.49 MB, etc. I didn't not do anything at all, but open them. Without a doubt, it's something I should have learned (maybe you) long, long ago, but it has baffled me now. Very grateful for any help.

The size you see in the finder is the compressed size. When you open it in Photoshop, you can see the enlarged size.

Tags: Photoshop

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