"Virtual" magenta cast in zoomed out photos
Quite often I see a sort of magenta cast in zoomed out photos, both in portions with a strong backlight and sometimes in rendering of some portions. The two screenshots below with the loupe demonstrate that the cast is "virtual", that is by zooming at pixel level everything is fine. But this is annoying during the process of evaluating the photo and possibly applying fixes: while in the former case (strong backlight) the phenomenon is somewhat expected, in the latter case (see the grainy concrete) it's really misleading.
Is it only me or a known problem?
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I don't think the issue is related to my aging eyes (that unfortunately are really aging), since I've been seeing that since when I switched to C1 several years ago and with considerably lower resolution displays. And — of course — still with my current Mac if I lower the resolution. The simpler test is to really enlarge the two photos I posted above, and I still see the colour cast.
Being related to areas with fine details and high entropy I suspect it's related to the compression of the preview image you mentioned. At the moment I'm using 3840 pixels previews, a setting that can be incremented to 5120. Maybe it could improve things, maybe not. And I have to guess the impact on the disk usage.
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I'm going to post a separated discussion about white balance, but I think it's not related: in fact it's more about green cast rather than magenta, in the end I get the result I want, but I suspect working more than necessary (it's basically a workflow efficiency issue more related to the auto-white balance tool than white-balance in general).
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