There's something that should be mentioned here.
Once saved for web (JPG's) are saved as 8-bit files.
The important part here is when processing images in Photoshop, that they be worked on as 16-bit images; non-linear stretching will show banding and all sorts of other wonderful artifacts on 8-bit images. My understanding is that if you begin with an 8-bit image, convert it to a 16-bit image in Photoshop and work on it, there will be no gain as you only have 8-bits of data to begin with. This is why working on original JPGs sucks the big one.
Once processed, do your finalising, then convert to 8-bit and save for web.
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