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fading colour photographic images
In message , Steve Hayes
writes: On Tue, 30 Oct 2018 12:04:04 -0400, Wolf K wrote: On 2018-10-30 11:15, J. P. Gilliver (John) wrote: [...] What does anyone think - is it _possible_ that such a slider could become a common control in image manipulation software, or is it just too difficult (too many variables)? It's too difficult. You need to adjust each colour channel plus contrast, brightness, saturation, and gamma. "Hue" is sometimes offered as a method of adjusting all colour channels at once, but in my experience it's a kluge that rarely works Irfanview and XnView do a nice job with automatic level/contrast adjustments. I recommend both. I use Irfanview, and I've foudn that each batch of film is different, because each one is at a different stage of fading, so really one needs to do each picture individually. Indeed; and for a lot of cases, all that will be available is a print, so even batching isn't on, as each print will have had different exposure. (Even if they've been on the same shelf, how the sun from the window falls on them will be different.) For some Irfanview's "Auto-adjust colors" works, but even for those, some extra tweaking is often required. Thanks, I'll have a look at it. -- J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf "He who will not reason is a bigot; he who cannot is a fool; he who dares not is a slave." - Sir William Drummond Above all things, use your mind. Don't be that bigot, fool, or slave. |
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