photshop: why low quality jpg saved as high quality increases the file size?

Posted by Alex Angelico on Pro Webmasters See other posts from Pro Webmasters or by Alex Angelico
Published on 2011-11-30T00:29:07Z Indexed on 2011/11/30 2:07 UTC
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photoshop

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jpeg

i have a low quality background about 85kb. If I open the file in Photoshop and save it, I have to save this image as 100% quality, the file size increases to 640kb. This doesn't make sense, the image si already compressed, the quality cannot be better than the source, so the 100% quality while saving should produce THE SAME FILE OPENED.

The problem is, I have this background and want to add a logo image over it, and then save it. But If I do so, i have to save this with 10% quality, and the logo looks horrible. If I save this to 100% quality, the file size is huge...

How can I achive this?

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