The problem is that other 5%, and frankly I can't tell by just looking at the image if problems are going to arise in the restoration work. I suspect that an 8-bit jpeg will be more than sufficient for 95% of the images I've worked on. I expect that the issues were likely due to pushing the PP software to extremes and building on additive errors of the various incremental steps I was taking. I found I had to spend a fair bit of time cleaning up artifacts, that I suspect might have been the result of using an 8-bit image. These adjustments are definitely more extreme than what one would encounter in normal day-to-day PP work from a digital camera capture (unless the exposure was totally blown). I this kind of work, there can be some fairly heavy duty adjustments, to bring back the colours by working on a channel by channel basis.
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