Re: iPhoto, Photoshop 7 and Profiles
Re: iPhoto, Photoshop 7 and Profiles
- Subject: Re: iPhoto, Photoshop 7 and Profiles
- From: Chris Murphy <email@hidden>
- Date: Mon, 28 Oct 2002 09:48:02 -0700
On Sunday, October 27, 2002, at 11:00 PM, Arnold <email@hidden>
writes:
I use image capture in OSX 10.2.1 to download images from my Kodak
DC280 camera to a folder on my harddrive. The image capture options
have "embed Colorsync profile" set to off. Then I import those photos
into iPhoto 1.1.1.
iPhoto is set up to open the images in Photoshop 7.01.
When I open the photos in PS7, it claims that an sRGB profile is
embedded.
An sRGB profile isn't really embedded. The warning is misleading. sRGB
color space is being referenced in the image by EXIF data which
contains a variety of information about the shot from your digital
camera. Photoshop sees a color space "tag" in EXIF which is set to
sRGB, and Photoshop 7 treats it as a defacto profile. There is a
plug-in at the Adobe web page to ignore the EXIF data, which is
probably not a bad idea.
I make now 3 copies of a photo in iPhoto and do the following:
1st: don't modify it
2nd: I assign Adobe RGB profile in PS7 and save
3rd: I convert to Adobe RGB in PS7 and save
If you assign Adobe RGB, you cannot convert to Adobe RGB - you get a
null transform because the source and destination are the same. So all
you have done is assign Adobe RGB and saved. Step 3 effectively does
not happen.
Now back in iPhoto I change my preference to open photos instead of in
PS7 back to "in separate window".
In iPhoto the unmodified image looks exactly the same as the one with
the "assigned Adobe RGB" profile. The image with the converted profile
looks much lighter.
I'm unable to reproduce this. #2 assign Adobe RGB and #3 convert to
Adobe RGB look identical to me in Photoshop, and look a little redder
in iPhoto, which is to be expected since it doesn't honor embedded ICC
profiles for on-screen preview.
e) Does embedding a profile mean assigning or converting in PS7 terms?
Embed loosely is equivalent to assign. It does not mean convert.
Chris Murphy
Color Remedies (tm)
Boulder, CO
303-415-9932
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