Re: Dell UP2516D
Re: Dell UP2516D
- Subject: Re: Dell UP2516D
- From: Wire ~ via colorsync-users <email@hidden>
- Date: Sun, 5 Jan 2020 14:55:07 -0800
I think I got controls wrong for the verify pass in Dcal. I've
double-checked and remeasured and updated the posted report.
I raised peak brightness to 170, per wikipedia writeup on Adobe RGB viewing
assumption and resmeasued.
Saw this "History of Adobe RGB" in the wikipedia writeup. I like how it
reveals how uncertain the process of progress can be.
//Beginning in 1997, Adobe Systems was looking into creating ICC profiles
that its consumers could use in conjunction with Photoshop's new color
management features. Since not many applications at the time had any ICC
color management, most operating systems did not ship with useful profiles.
Lead developer of Photoshop, Thomas Knoll decided to build an ICC
profile around specifications he found in the documentation for the SMPTE
240M standard, the precursor to Rec. 709. SMPTE 240M's gamut was wider than
that of the sRGB color space, but not by much. However, with the release of
Photoshop 5.0 nearing, Adobe made the decision to include the profile
within the software.
Although users loved the wider range of reproducible colors, those
familiar with the SMPTE 240M specifications contacted Adobe, informing the
company that it had copied the values that described idealized primaries,
not actual standard ones. The real values were much closer to sRGB's, which
avid Photoshop consumers did not enjoy as a working environment. To make
matters worse, an engineer had made an error when copying the red primary
chromaticity coordinates, resulting in an even more inaccurate
representation of the SMPTE standard.
Adobe tried numerous tactics to correct the profile, such as
correcting the red primary and changing the white point to match that of
the CIE Standard Illuminant D50, yet all of the adjustments made CMYK
conversion worse than before. In the end, Adobe decided to keep the
"incorrect" profile, but changed the name to Adobe RGB (1998) in order to
avoid a trademark search or infringement.[1]//
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