[Openicc] seeking for advice on rendering intent and black point compensation

[Sven Neumann]

Hi,

On Wed, 2007-10-03 at 17:03 +0100, Alastair M. Robinson wrote:

> Just to clarify, as GIMP currently stands, if your working space is set 
> to sRGB and you try to load an image with the AdobeRGB profile embedded, 
> you're asked if you'd like to convert the image to the working space 
> profile via an AdobeRGB -> sRGB transform.
> 
> If you decline the offer, will that image be displayed by GIMP using the 
> generic sRGB -> Display transform used for regular images, or will a 
> separate Embedded profile (Adobe) -> Display transform be used when 
> displaying this image?

If you decline that offer and keep the color profile attached, the
display correction filter will take it into account and use a separate
Embedded profile (Adobe) -> Display transform. There are however some
areas such as plug-in previews which are not (yet) color corrected.

> It's also entirely possible that an advanced user would want to choose 
> the intent on a per-image basis - one might want to treat an image from 
> a scanner differently from one that's ready for printing, for instance, 
> so I would be in favour of being able to choose the intent when being 
> asked whether to convert.

That is currently not possible. You can however decide to keep the color
profile and then convert it manually by choosing the color profile
conversion from the image menu. This will give you more control over the
conversion and allows to specify rendering intent and black point
compensation.

Since I would like to keep the conversion dialog that is shown when
loading the image as simple as possible, I would rather not add more
controls there. Good defaults (which could be configurable in the
preferences) are needed here. The question is now whether the
preferences for this conversion should be shared with the preferences
for the display color correction. As far as I understand you, you
disagree with this and suggest to add another preference option (or two
if BPC is kept separate).

I am wondering now how often someone will want to choose a different
rendering intent. If it happens only in some rare corner cases, then it
should be OK to take the extra step of doing the conversion manually, as
described above.


Sven