Re: ColorSync inconsistency in iPhoto
Re: ColorSync inconsistency in iPhoto
- Subject: Re: ColorSync inconsistency in iPhoto
- From: Chris Murphy <email@hidden>
- Date: Thu, 10 Feb 2005 15:17:40 -0700
Pete,
I think what's happening is that iPhoto is normalizing to Generic RGB
in three situations, two of which call for a conversion:
1. Assumed source for untagged images. (We've discussed on this list at
length how intellectually absent this decision is on Apple's part, and
their unwillingness to demonstrate how they came to their decision to
use Generic RGB instead of sRGB like the rest of the world; ergo it was
a political decision, not one based on facts.)
2. Editing images (conversion from embedded source to Generic RGB as
destination, retagging with Generic RGB).
3. Outputting images for purchase (books or prints). It may also be
converting to Generic RGB when printing locally but I haven't confirmed
this yet. (Conversion is from embedded source to Generic RGB as
destination, retagging with Generic RGB.)
At the moment, I don't believe iPhoto 5 is ignoring embedded profiles
and improperly retagging them with Generic RGB. More testing is needed
however. If iPhoto converts files without prompting at all, and to
Generic RGB on top of it, then iPhoto remains a polluted application
for even prosumer use, let alone professional use. I find no undo
option, or user intuitive way of getting back to the original files,
and this amounts to yet another assault on end user data. It's
effectively data loss.
In this respect, iPhoto 4 is safer because at least it isn't performing
automatic conversions.
Once again, I think Apple continues to demonstrate that color
management is not a priority, when the only way they are willing to
make it work is by piping our data through one of the lowest common
denominator spaces. There's no reason why files need to be converted at
all unless transmitting them to Ofoto - and even then I will bet there
are colors captured, that could be printed, but are being clobbered by
the conversion to Generic RGB. It's all around a bad decision on
Apple's part. They try to make color management streamlined and simple,
but they opt for nearly the lowest quality option possible in order to
do so, when it isn't necessary.
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
-------------------------------------------------------------
Co-author "Real World Color Management, 2nd Edition"
Published by PeachPit Press (ISBN 0-321-26722-2)
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