Color management plugin: Purpose, Workflow?

[Marcel Wiesweg]

Hi,

the color management / soft-proof plugin in the image editor is currently
slightly broken and in a pretty bad shape.

Before fixing it, I have to find clear answers to these questions:
For which operations is this plugin intended?

What are the use case, where in the workflow do you use this plugin? Which
parameters of the image do you change here?

Thanks
Marcel
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[Milan Knížek]

Marcel Wiesweg píše v So 12. 09. 2009 v 16:17 +0200:
> Before fixing it, I have to find clear answers to these questions:
> For which operations is this plugin intended?

For soft-proofing the image before printing on the inkjet. This requires
also the possibility to choose the colorimetric intent + BPC and see the
out-of-gamut colours.

However, it would be better to have soft-proofing as a standard mode for
displaying, so that the user can  see changes of other types of
adjustments on-the-fly (like curves, levels, ...). E.g. GIMP has this
hidden in the Settings/CM (not so great) and CinePaint allows to select
it right from the menu View (which is convenient).


For conversion from wide gamut to sRGB - just for the purpose of
emailing, web publishing. Here the preview is not actually so important
since I cannot control the display of other users (calibrated?) anyway.
Hence I usually do this as part of a batch run from the shell.

Some users may want to use it for conversion to a printer profile before
sending the file out to the printing company.

regards,

Milan Knizek
knizek (dot) confy (at) volny (dot) cz
http://www.milan-knizek.net - About linux and photography (Czech
language only)

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[Marcel Wiesweg]

> For soft-proofing the image before printing on the inkjet. This requires
> also the possibility to choose the colorimetric intent + BPC and see the
> out-of-gamut colours.

Specifying the printer profile is clear (btw: do you have a "classic" example
profile for me for testing?)

The plugin currently allows to specify an input profile and a workspace
profile. I dont see why. In the image editor, usually each image has an
assigned profile and there is a set workspace profile. So I would remove these
extra settings in the plugin?

>
> However, it would be better to have soft-proofing as a standard mode for
> displaying, so that the user can  see changes of other types of
> adjustments on-the-fly (like curves, levels, ...). E.g. GIMP has this
> hidden in the Settings/CM (not so great) and CinePaint allows to select
> it right from the menu View (which is convenient).

You mean something like the over-exposure indicator currently, that can be
toggled on and off as needed?

>
> For conversion from wide gamut to sRGB - just for the purpose of
> emailing, web publishing. Here the preview is not actually so important
> since I cannot control the display of other users (calibrated?) anyway.
> Hence I usually do this as part of a batch run from the shell.

I plan to make a little assign/convert plugin, to offer color space conversion
from the menu directly, and also add a task to the batch queue manager. But
most of that won't make it for 1.0.

>
> Some users may want to use it for conversion to a printer profile before
> sending the file out to the printing company.
>
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[Milan Knížek]

Marcel Wiesweg píše v Po 14. 09. 2009 v 22:27 +0200:
> > For soft-proofing the image before printing on the inkjet. This
requires
> > also the possibility to choose the colorimetric intent + BPC and see
the
> > out-of-gamut colours.
>
> Specifying the printer profile is clear (btw: do you have a "classic"
example
> profile for me for testing?)
I sent it directly to you.

> The plugin currently allows to specify an input profile and a
workspace
> profile. I dont see why. In the image editor, usually each image has
an
> assigned profile and there is a set workspace profile. So I would
remove these
> extra settings in the plugin?
I guess the current plugin can be removed as such.
The profile mismatch (embedded versus workspace) is solved on opening
the image.
Printer profile is in Settings.
Manual conversions/assignment - you describe it below.

> > However, it would be better to have soft-proofing as a standard mode
for
> > displaying, so that the user can  see changes of other types of
> > adjustments on-the-fly (like curves, levels, ...). E.g. GIMP has
this
> > hidden in the Settings/CM (not so great) and CinePaint allows to
select
> > it right from the menu View (which is convenient).
>
> You mean something like the over-exposure indicator currently, that
can be
> toggled on and off as needed?
Exactly. It could be a sub-menu:

Colour Management / [on/off] Colour managed view
                    [on/off] Soft-proofing
                    [on/off] Simulate paper white
                    [on/off] Out of gamut colours
                    Intent / [on/off] Relative
                             [on/off] Absolute
                             [on/off] Perceptual
                             [on/off] Saturation
                             [on/off] BPC.

The Soft-proofing makes sense only if Colour Managed View is enabled.
The Simulate paper white makes sense only if Soft-proofing is enabled.
The default values for Colour Managed View and Intent should be those
set in Settings.
Only one of Relative, Absolute, Perceptual and Saturation may be chosen,
while BPC may be combined with any of the intents.

> > For conversion from wide gamut to sRGB - just for the purpose of
> > emailing, web publishing. Here the preview is not actually so
important
> > since I cannot control the display of other users (calibrated?)
anyway.
> > Hence I usually do this as part of a batch run from the shell.
>
> I plan to make a little assign/convert plugin, to offer color space
conversion
> from the menu directly, and also add a task to the batch queue
manager. But
> most of that won't make it for 1.0.
Good.

BTW: Your effort is highly appreciated.

Regards,

Milan Knizek
knizek (dot) confy (at) volny (dot) cz
http://www.milan-knizek.net - About linux and photography (Czech
language only)


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