Re: Possible ColorSync discontinuity bug introduced in OS
Re: Possible ColorSync discontinuity bug introduced in OS
- Subject: Re: Possible ColorSync discontinuity bug introduced in OS
- From: Andrew Rodney via colorsync-users <email@hidden>
- Date: Thu, 15 Aug 2019 09:37:39 -0600
> On Aug 15, 2019, at 9:14 AM, David Miller via colorsync-users
> <email@hidden> wrote:
>
> There’s definitely something wrong here in 10.14.6, and you don’t even need
> to use a display profile to see it.
>
> Set the display profile to Adobe RGB. It uses the TRC tags with the “curv”
> type and
> simple gamma value. It also doesn’t have any calibration LUTs, which
> essentially
> turns off all LUT calibration and linearizes the contents of the video card.
>
> When you do this, use a 256 grayscale image with evenly spaced steps in
> Preview.
Yes, I do see this in Apple Preview viewing a 21 step wedge TIFF using Adobe
RGB (1998) as you advise. Safari and ColorSync Utility too.
I don't see it in Photoshop CC (latest version). I don't see it in Lightroom
8.4 in either Library or Develop modules. And this isn't limited to Adobe
applications, GraphicConverter 9 matches Photoshop and Lightroom.
So yes, there's a bug but it's not affecting all applications equally. It does
affect all Apple app's I've tried and it suggests Apple needs better beta
testers like many who post here.
Andrew Rodney
http://www.digitaldog.net/
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