Re: untagged RGB data
Re: untagged RGB data
- Subject: Re: untagged RGB data
- From: Roberto Michelena <email@hidden>
- Date: Mon, 22 Dec 2003 01:56:22 -0500
On 12/20/03 3:33 PM, "John Zimmerer" <email@hidden> wrote:
>
What it appears
>
you and others are agreeing on is that having a single definition of
>
RGB for untagged data is OK (some would prefer sRGB to Generic RGB),
>
but that the OS should match all untagged data from this singular space
>
to the display, which we currently don't do. I happen to agree, and as
>
soon as this can be done without slowing your machine to a crawl, we'll
>
do it.
Hallelujah!
Besides the fact that CPUs are getting faster all the time, it's true that
color matching via ICC profiles is a heavy task.
My take: when data is not tagged, maybe display accuracy should be
sacrificed for the sake of speed, in non-pro applications. In other words,
in Preview, Safari, iPhoto (or maybe not), etc.
How? By writing a specialized and heavily optimized color matching routine
that works with something that is not necessarily an ICC-standard link
profile, but that has been calculated from the pairing of the RGB default
profile (ideally sRGB, but configurable) and the display profile. So when a
user changes display profiles or changes the default RGB profile, this
speed-optimized link table (ICC format or otherwise) gets recalculated and
overwritten to disk. And for untagged images, this is what gets used, along
with the optimized routine (not the standard cmm) that is specially written
for it and puts speed before accuracy. Maybe even that routine could be
written for the video card's GPU instead of main CPU.
-- Roberto Michelena
EOS S.A.
Lima, Peru
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