[argyllcms] Re: Green tint on transparency in macOS
- From: Florian Höch <lists+argyllcms@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 21 Jul 2017 14:11:10 +0200
Am 21.07.2017 um 07:56 schrieb Aaron Jensen:
On July 20, 2017 at 10:25:33 PM, Graeme Gill
(graeme@xxxxxxxxxxxxx(mailto:graeme@xxxxxxxxxxxxx)) wrote:
(It's not clear to me
what profile the Mac assumes in color managing the desktop though.)
It probably is sRGB, but one can only assume.
With the built-in profile it’s 239 239 239. With the bad profile it’s
240 255 240 (because it’s slightly translucent and blurred I may not
have measured from the exact same spot).
Ok. So assuming 239 239 239 is from a null transform(?), looking that up
through the sRGB profile using xicclu gives L*a*b* 94.45 0.02 -0.02
(a*b* being slightly nonzero could be ignored and rounded to 0).
Looking up these L*a*b* values through the profile (green.icc) in the
backward direction (B2A) gives RGB 237.41 237.5 237.83 which seems
reasonable.
Looking that up through the profile's calibration gives RGB 237.82
237.62 235.34 which seems reasonable as well.
There's also the matter of where the video lookup tables come into play.
For instance, does loading a linear calibration change the effect ?
(i.e dispwin -c)
Problem with dispwin -c is it won't stick under Mac OS X as far as I'm
aware.
Florian.
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