Re: iphoto colormanaged?
Re: iphoto colormanaged?
- Subject: Re: iphoto colormanaged?
- From: Roger Howard <email@hidden>
- Date: Tue, 4 Jan 2005 12:05:13 -0800
On Jan 3, 2005, at 11:42 AM, John Gnaegy wrote:
When I import images (tagged with sRGB) from my digital camera into
iphoto
they look much lighter than in Photoshop. Quitting iphoto and
reloading it
does not alter anything. If I assign Colormatch in Photoshop the
image looks
identical in both apps. Any idea what could be wrong? I use Mac OSX
10.3.7.
The problem is that the images originally did not contain an sRGB
profile yet Photoshop told you they did. There's an EXIF field stored
in digital camera images as a 0 or a 1, one of which meaning "sRGB"
and the other meaning "other". It's pretty vague, and I think not a
great idea to begin with, but there it is. When Photoshop sees that
value it tells you there's an sRGB profile in the image, which is
unfortunate because it'll tell you the same thing whether there's a
real profile in there or just the EXIF field. For Photoshop 7 there's
an update to make it stop doing that, for Photoshop CS there's a
preference to make it stop doing that.
FYI, EXIF/DCF has officially supported Adobe 98 and a new space, sYCC,
for about a year, since DCF 2.0 and EXIF 2.2 I believe - not sure what
camera makers support this, but I'm pretty sure at least several do - I
don't shoot in JPEG so it hasn't come up for me.
As for whether it was a good idea - I personally believe it was. Like
defining sRGB as a standard for Web images, DCF was meant to simplify
color for folks who don't understand color management or can't make it
work, by defining some basic conventions (and using sRGB is as close to
simple color mgmt as we've got today)... the fact that many mfg's took
the cheap way out and didn't properly conform their images to sRGB was
a shame, but then if they had claimed another color space it would have
been just as unlikely to be an accurate characterization. Specifying
sRGB as a common space for digicams was a good idea, IMHO, just like
supporting sRGB in printers and elsewhere by default - it was the
implementations that stunk.
Anyway, at least Adobe 98 can be properly recorded in digicam images
now. For what it's worth, I'd prefer iPhoto and Image Capture honor the
tags, rather than second guess them and apply an equally inaccurate
guess if that's what's happening (unless Apple has characterized each
camera model and can provide even better custom profiles!).
-R
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