Relative Color and Black point compensation.
Relative Color and Black point compensation.
- Subject: Relative Color and Black point compensation.
- From: "tl" <email@hidden>
- Date: Tue, 27 Jan 2009 07:16:38 -0500
Hi to all,
I was very glad to see those questions and comments about Relative Color and
black point compensation. We are currently living with a legacy of bad
implementations and it is really holding back the growth and acceptance of
color management at the lower levels of the market place. We've been taking
a look at this situation and it is very grim. Many very popular
applications fail to implement BPC on display and this poses a rather large
problem for vendors of display profiling applications. While Apple has a
strong group involved in color management, they don't seem to be able to
convey best practices to their internal developers. Applications such as
Safari and Preview are ostensibly color managed but we see evidence that
they do RelCol but they do not seem to have implemented Black Point
compensation. On the Adobe side we find that Photoshop works correctly ,
but I am told that Light room displays without BPC. For displays with wide
dynamic ranges, this is not too much of an issue, but for many displays with
modest contrast ratios, this is a real issue. The result is clipped shadows
on the display. The lesson: the fact that an application is color managed
should not lead one to conclusion that color management has been implemented
correctly.
>From a vendor standpoint this situation is intolerable, because we end up
getting the phone call. I have to say that my own company is not blameless
here either. In our lower end products (Huey), we essentially write the
display profile assuming a blackpoint of zero. This results in a lower
contrast simulation inside of photoshop. This was my responsibility. I
wrote to the lowest common denominator because I thought that the amateurs
would be more likely to be using the platform centric apps which were not
handling BPC properly. In our higher end applications (i1Display and Muki
and above) we expect color management to work properly and write canonical
profiles that describe the shadow performance in normalized manner that does
not result in zero at the blackpoint. Our next generation of products will
handle this issue uniformly. The ICC has been active in trying to get
vendors to do the right thing. The DevCon was well attended this year, and
our speaker from X-rite, did highlight issues such as these. We've been
looking at these problems for almost twenty years and we are close, but not
quite there. I am happy to report that over Xmas vacation I was actually
able to get Lightroom 2.0 and Photoshop CS3 to print the same image
identically (at least visually) on an Epson r2400 printer. Unfortunately,
they didn't look the same on the display..
Regards,
Tom
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