Re: colorsync-users Digest, Vol 16, Issue 61
Re: colorsync-users Digest, Vol 16, Issue 61
- Subject: Re: colorsync-users Digest, Vol 16, Issue 61
- From: David Miller via colorsync-users <email@hidden>
- Date: Sat, 17 Aug 2019 12:22:40 -0400
>
>> 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/
>
More info:
1. It’s not just Preview. Using QuickLook, for displaying images in a window
directly from the Finder, without
opening into any other application, also has the same problem. The fact that
the wrong behavior exists
at the base level of OSX functionality (both Quicklook as the “basest”, and
Preview as the next level up) is
a problem. And, Preview is color managed and the Finder (for QuickLook) is as
well; both Preview and
QuickLook honor display profiles when an image is opened and manually dragged
between
calibrated displays on the same system.
2a. The problem does not exist in OSX 10.14.2 (I have one partition I can still
boot that way). So this is
a new problem that wasn’t in the early releases of Mojave; it cropped up
somewhere between
10.14.3 and 10.14.6.
2b. The problem does not exist in OSX 10.13.6 or earlier (also confirms that
this is a new problem)
David Miller
Manager/Lead Developer, Consumer Graphics
Datacolor
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