Hi everyone,

Recently I've tried using the ociotoicc utility with a lut on the command line. When I try to load the icc file into photoshop, I receive:
"Could not load the RGB working space because the profile is not a valid RGB working space profile."

 I've tried .cube's, 3dl's. I've even tried changing some of the tags in the icc profile, nothing has worked so far.  When I'm looking at the different tags, it looks like a normal icc profile. I've attached it to the document.

Anyone else having this issue?

Thanks!

- Gresham

Hey Marie and Malcolm,

Thanks for the feedback.  I was able to add a descriptor argument when creating the icc profile and it ended up working.

This might be a great opportunity to talk about what people's matte painting to comp workflows are (photoshop to nuke in particular).  I've found that there are 3 different areas where you can utilize an icc profile within photoshop.

First is the "working spaces" area in the Edit > Color Settings menu.
Second is imbedding the icc into the document via Edit > Assign Profile.
Third is setting up a proof in the View > Proof Setup > Custom menu.

Each one in that order, overrides the previous.

I've also noticed that using the first and second methods to apply an icc profile, it also affects the color picker and weights the colors according to the lut.  When I set the icc via the proof setup, it doesn't affect the color picker.

Currently what I'm doing is applying my lut through the "assign profile" area and then creating a sRGB icc profile with nuke's sRGB math and setting that to my proof setup. That way an artist can hit ctrl + Y to turn on and off the lut baked icc.

Now that I've been thinking about it more, it might make sense to choose the sRGB icc profile as the default and setting the lut baked icc to the proof so the matte painter is painting in their....semi-neutral colorspace and every now and then will hit ctrl+y to check their work with the lut on.

What are people's thoughts? Do you think most matte painters would want to work with lut on by default (like most compers do in nuke) or work in a neutral color space and then check their work every now and then with a lut on?

Thanks,

- G

On 11/25/2011 2:15 AM, Malcolm Humphreys wrote:

Hi Gresham,

Where are you these days?

The icc profiles generated from any of the ocio tools can only be used as 'soft-proofing' profiles.

I'm not sure if your interested in the technical details but in brief as ocio is a RGB only system internally (rather than XYZ or Lab). This means that 3D luts can only process in the fwd direction (it doesn't matter which cube format you use).

For a 'working space' icc profile you need 2 transforms a fwd and reverse (in Lab or XYZ) for it to be valid, for this and the above reason this is not possible to generate a profile with ocio and with the RGB cube that you have.

You should be able to load your 'soft-proofing' profile over from the window menu (i think..) in photoshop, I guess we should document this. A 'soft-proofing' profile doesn't change the 'working space' of your file just shows you what your file would look like when viewed/printed on the target device which your profile describes.

.malcolm

On 25 Nov, 2011,at 07:40 PM, Gresham Lochner <gresham...@...> wrote:

Hi everyone,

Recently I've tried using the ociotoicc utility with a lut on the
command line. When I try to load the icc file into photoshop, I receive:
"Could not load the RGB working space because the profile is not a valid
RGB working space profile."

I've tried .cube's, 3dl's. I've even tried changing some of the tags
in the icc profile, nothing has worked so far. When I'm looking at the
different tags, it looks like a normal icc profile. I've attached it to
the document.

Anyone else having this issue?

Thanks!

- Gresham