Strong red color cast over some images, solved

Hi,
This issue was driving me nuts recently, but having just found the solution I thought I'd share in case anyone else runs into the same issue.
From one day to the next, my Mac (late 2013 MBP retina, Mavericks) suddenly started to display some (not all) images with a red semitransparent overlay.
This would occur most often in Apple applications like Finder, Preview, Safari, Mail etc.
In the Finder's icon view with a folder full of images, some thumbnails would have the color overlay, some others wouldn't. When resizing the thumbnails the overlay would flicker on and off on various images randomly.
Affected images would also print with the same color cast on a color printer.
The Solution
After a lot of trial and error I found that the issue was caused by a custom libpng library, installed by Homebrew (http://brew.sh).
It was probably installed much earlier than this this issue started, maybe the library was updated that day, or something in OSX was updated triggering an incaompatibility leading to this issue.
I'm not sure why I installed this library in the first place, most likely as a dependency needed by another recipe I since uninstalled. I could uninstall it without issues.
Caveat: to fully uninstall a recipe, use:
brew uninstall <recipe> --force
in my case I did:
brew uninstall libpng --force
Otherwise Homebrew will reinstall the library the next time you upgrade your brew installation (which is most likely what happened in my case).
Hope this helps at least someone.

Hi, Chan
Thanks for the explanation of this subject. Anyway ... there are quite a number of possibilities that something is clipped during whole process. First, some channels can be clipped off at the sensor level, than after matrix conversion to RIMM, than if EV slider is used (and even if it isn't, because there is baseline exposure value) ... or Saturation slider ... then after correction using LUT ... and finally during conversion to sRGB / AdobeRGB / whatever ... maybe some sort of soft clipping at some of these points would be better (just my opinion)
However, there is another highlight issue I noticed, illustrated with these two samples (Canon 400D, ACR 5.7, windows platform)
http://www.megaupload.com/?d=4KEEDQW9
Left picture has all default settings. On the right picture, everything is the same, except that I made a small patch with adjustment brush tool at the top left corner (far from the center of the picture) and changed exposure value of the adjustment brush to a nonzero value (other adjustment brush sliders don't produce similar strange effect). Appearance of the area of the Sun changes abruptly and looks strange. Test with my HSV image from previous post shows that all colors are affected (not only yellow)
Also, there is a similar abrupt change in the highlight behavior if I lower the global EV slider from -0.25 to -0.30 (0.25 is baseline exposure value for this camera), or if I raise Recovery slider from 6 to 7 (which seems to have similar effect). I think these two issues are unrelated to clipping in sensor color space vs. RIMM
Thanks

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