I know just enough about colour management to get myself into trouble.

On Gimp 2.4.6, there are now some new options under the Image > Mode >
menu path, namely

@   Assign to Color Profile // Actually uses Little CMS (lcms)
@   Convert to Color Profile // Actually uses Little CMS (lcms)

@   Assign colorspace  // Hmmm, should be 'Color Space' for niceness?
@   Convert colorspace  // Likewise!

At the moment there are no Help topics nor topics on the User Manual
site for these menu options, so can some Photoshop, graphic arts, or
prepress guru assist with these queries:

@   What does *assigning* an image to a colour profile do and what
effect does it have on colour management downstream?
@   How is *converting* an image to a colour profile differ from
"assigning", and what effect does it have on colour management downstream?

How is assigning or converting a *colour space* different from a
*colour profile*?  The options appear to be the same as for colour
profiles.

Are these two sets of lcms and Gimp dialogue alternative ways of
getting the same result on the image, or is one set changing the image
file and the other is actually doing something to the profile files
(aaaarrgghhhh!)?

For example, the image I am looking at has these options ...

*Assign ICC Color Profile */// Little CMS dialogue/
      Current Color Profile: Adobe RGB (1998)
      Assign: [ Adobe RGB (1998) V ] /// drop-down list/

... but ...

*Assign colorspace */// //Gimp dialogue/
      Current colorspace: None (use RGB workspace temporarily)
      New colorspace:
         (o) Unassign colorspace
         ( ) Workspace: Adobe RGB (1998)
         ( ) Profile: [ Not selected V ] /// drop-down list/

The conversion dialogues have these options ...

*Convert to ICC Color Profile */// //Little CMS dialogue/
      Current Color Profile: Adobe RGB (1998)
      Convert to: [ RGB workspace (Adobe RGB (1998)) V ]
      Rendering intent: [ Perceptual V ]
      [ ] Black point compensation

... and ...

*Convert colorspace */// //Gimp dialogue/
      Source colorspace: None (use RGB colorspace temporarily)
      Rendering intent: [ Perceptual V ]
         [ ] Use BPC compensation
      Destination colorspace:
         (o) Workspace: Adobe RGB (1998)
         ( ) Profile: [ not selected V ]
      [ ] Flatten image to preserve appearance

Sure hope a developer is reading this list and can assist the puzzled
and the troubled!

Regards,
Hedley

--

Hedley Finger

28 Regent Street   Camberwell VIC 3124   Australia
Tel. +61 3 9809 1229   Fax. (call phone first)
Mob. (cell) +61 412 461 558
Email. "Hedley Finger" <[EMAIL PROTECTED]>

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