Vuescan infrared clean software#

If I recall correctly, the scan was using sRGB. I ran into a situation early last year where someone asked me to redo a colour wedding photo that was both faded and stained and all they had was someones jpeg scan for me to work with (no original available). If we just do a few operations, it probably won't be noticeable 95% of the time, but as you also say, you cannot visually predict which ones will be 'compromised' by reduced bit depth, so safer to work 16 bit/channel, as indeed was my intention. In respect of bit depth for scans, to clarify, if I were doing it, the very first task upon opening the 8 bits/channel original scan would be to convert it to a 16 bit workspace so that I don't lose any data when post processing - and (of course), save it with a different file name - rule #1 NEVER overwrite an original file.ĪFAIK, almost any manipulation of say, exposure values, is going to result in the resultant math on given pixels exceeding 8 bit depth. 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.

Vuescan infrared clean software#

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.