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Subject: Faux RAW Hoorah



This sorta is a Camera Raw question. It's definitely a 16 bit image question.

Editing Raw files in Photoshop makes for a non-destructive edit. And the histograms retain smooth, gap-free curves after a Layers adjustment for example.

Comparatively, after adjusting an 8 bit image in layers, the histogram shows gaps in the curves which means possible banding in the print..

What's interesting, is that some of my non-RAW 8 bit images are allowed to be converted up to 16 bit. And they adjust smoothly, just like RAW images, according to the histogram at least.

So, does converting the 8 bit JPEG to 16 bit really save the quality of the print by quartering each pixel and making for subtler 16 bit type adjustment increments? Is that smooth histogram seen afterward misleading or is there really less chance of banding?

Is there any reason NOT to convert up from 8 bit to 16 bit? If it's only about non-destructive edit, I could always do an adjustment layer. No?

The reason I would want to start with 8 bit is file size filling up my camera's memory card(s) in the field. Also there are a lot of old 8 bit images out there that could become more maleable.

And is there some reason I'm not understanding that the 8 bit images from my camera are allowed to be converted up to 16.

Thanks.

D Akey

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