Installing ICC profile

PS
Posted By
Prateek_Shrivastava
Aug 26, 2008
Views
269
Replies
8
Status
Closed
Hi All,
I am trying to convert an image to a standard ICC profile that I generate using GretagMacbeth Profilemaker. The problem is that the profile does not show up under the "image>mode>convert to profile" in Photoshop CS. What is strange is that the profile is available under the "image>mode>assign profile" option.
I have placed the profile at "C:\WINDOWS\SYSTEM32\SPOOL\DRIVERS\COLOR" and have installed the profile.
Thanks,
Prateek

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PF
Peter_Figen
Aug 26, 2008
Is this either a scanner profile or a camera profile? Both of those types will only allow you to convert FROM or assign, not convert to.
PS
Prateek_Shrivastava
Aug 27, 2008
It is a camera profile and thus based on your observation will not be allowed under convert option. Is there any other way in which I can embed the camera ICC profile into the image?
GH
Gernot_Hoffmann
Aug 27, 2008
Prateek,

you can assign the profile and then save the image WITH
profile.
But that’s not ideal. Better assign your camera profile
when opening, convert the image to AdobeRGB(98) and save it with this profile embedded.
Nothing lost, and the receiver of the file doesn’t need
your private camera profile.

If somebody should think that AdobeRGB(98) might be too
small:
<http://www.fho-emden.de/~hoffmann/camcal17122006.pdf>

Best regards –Gernot Hoffmann
PS
Prateek_Shrivastava
Aug 29, 2008
Gernot,
The output image that I am trying to get is one with its RGB numbers changed to reflect the camera profile. This new image I hope to further use in doing some analysis using C# and Matlab. Will the approach of saving image you have mentioned achieve this?
Best regards,
Prateek
Aug 29, 2008
Prateek,

If you open that image with the software respecting the profile assigned (so that any conversion done afterwards takes it into account), the answer is ‘yes’.

Anyway, even if you convert any RGB or CMYK image to a given profile, that profile is still needed, because it’s the way to relate a device dependent colour with a device independent space.

That ‘need’ can be solved just by sheer mention of the profile used if it’s a standard profile that can be obtained everywhere.

Hope it helps.
GH
Gernot_Hoffmann
Aug 29, 2008
Prateek,

IMO one cannot use Raw camera data as input for
ProfileMaker.
An accurate description of the calibration workflow
would be helpful.

In my workflow (as mentioned above) I had tested
three versions:
1. Save Raw as sRGB
2. Save Raw as AdobeRGB(98)
3. Save Raw as ProPhotoRGB

Each of these files can be used as input for Profile-
Maker. AdobeRGB is sufficient, in my humble opinion.

Using all versions, one gets three files and three
profiles P-sRGB, P-aRGB, P-pRGB.

For actual images (after the calibration) one has to use one of these Raw –> RGB conversions.
The respective profile is either already embedded, or
it has to be assigned in PhS, followed by Save As with
profile.

A possible workflow is described in my doc. There may be alternatives.

Best regards –Gernot Hoffmann
PS
Prateek_Shrivastava
Sep 2, 2008
Gernot,
The work flow that I am following is slightly different from what you have shared. Following is the work flow:
1.I am capturing the 24 chip Mini Macbeth using the camera and flash set-up as a jpeg image.
2.From this image I create the ICC profile (*.icc) using the profilemaker.
3.I am then trying to apply the ICC profile generated from step 2 to various images captured by the same camera and flash set-up.
Hope this gives you a better idea of what I am trying to accomplish.

Best regards,
Prateek
GH
Gernot_Hoffmann
Sep 2, 2008
Prateek,

JPEG isn’t a good choice, because tiny color shifts
are to be expected. On the other hand, these may cancel
by averaging for a patch (ProfileMaker).

But there is one question left: does the choice of JPEG
for your camera automatically imply sRGB as color space ?

The calibration shot of the target requires the assignment of a color space. Of course not the camera profile because this is not yet known, but preferably something with a wider space.

Best regards –Gernot Hoffmann

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