Why is photoshop decreasing my file size when saving it at it's max quality size?

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  • Updated 8 years ago
I've just noticed this recently with my PS CS4. I use a dSLR and shoot in large format, after uploading to my computer I usually run the images through PS for very simple editing and/or minimal cropping. I always "save as" at the largest size (quality). I've been ordering pictures from mpix.com and I've noticed that the max size I can print is 5x7 for most of my images, when they should be able to print at a 24x36. I've also uploaded pics on mpix just to experiment and my unedited images are still at 24x36 but my edited ones are drastically smaller.

Does anyone have some tips/advice? I'm doing the same exact thing I've done for 2 years now on PS CS4 and this problem is just now occurring.
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Molly Krohe

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Posted 8 years ago

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Chris Cox

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Ok, it sounds like you're mixing a few different concepts.

DSLRs are usually 35mm or cropped - far from large format. The camera may have a "large size" JPEG mode, but that is not the same as a large format camera.

The printable size doesn't change: it's defined by the number of pixels in the image. The quality it is saved as won't change the pixels, just the visual quality. JPEG options affect quality, not size in any way.

And how are you judging at what size the image is printable?