Canon 10D - color managment question

[nworbmit]

Heeeellllpp mmeeeee.

Canon 10D
Please correct me if I'm wrong.
I understand the Camera Preference to shoot
in ADOBE RGB as to mean the ADOBE RGB "color space".
This is opposed to assigning a color profile to the file.
A "Color Space" is the neutral space that "profiles" addresses when
they are making the conversion from the input (camera,scanner,etc) or to the output (printer,proofer,press) device. So my question is
Where do I find our how do a create a "color profile" for my Canon 10d?

Thanks
Tim Brown
Middletown, Oh

[maderito]

The captured image starts off as color numbers which must be converted to RGB values for your monitor and RGB or CMYK values for printers.

-For JPEG's the conversion is performed in-camera based on your choice in the camera's menu options: Adobe RGB or sRGB. Note that 10D Adobe RGB images are actually delivered out of the camera "untagged" and must be assigned to the Adobe profile by Photoshop or other application.

-For RAW images, the conversion of color numbers is completed outside of the camera in software. The image can be converted to any RGB color space, most typically Adobe RGB or sRGB.

Call the camera or processing assigned RGB color space the Image RGB Color Space.

Within Photoshop:
-For viewing: Image RGB Color Space numbers are translated to the Monitor color space via your Monitor Output profile
-For printing: Image RGB Color Space numbers are converted to the Printer color space via a Printer Profile

Outside Photshop (assuming Windows OS) in non color managed environments (e.g. the web):
-The Image RGB Color Space is assumed to be sRGB and is translated to the Monitor Color Space via your Monitor Output profile

Where do I find our how do a create a "color profile" for my Canon 10d?

You don't typically create a color profile. You choose it via the 10D camera menu system for JPEG's or you select it during RAW processing for RAW image files. It is possible to create custom camera profiles - but that's another story...

See http://www.computer-darkroom.com/ps8-colour/ps8_1.htm for more info. It's good reading that you'll find yourself going back to over and over again.

[scottbergerphoto]

Maderito,
I didn't ask the question, but I always learn something from your posts on color management.
Thanks,
Scott

[nworbmit]

As an example:
When I calibraite my scanner, I scan a target and print it (on my previously profiled printer). I use a colorimeter to analyse the
print and the profile creation software cranks out a calibrated profile for my scanner. I then choose this profile as my INPUT device profile.
If this taged image is not opened in photoshop, then photoshop - seeing that it is untaged - just opens it in the working space that is set as the default. Therefore the color link is not described from my scanner to photoshop unless an input profile has been tagged - by the scanner.

My question is, my canon 10d is churning out untaged images,
When I open them in Photoshop CS, they are opened in the default color space - I have set for Adobe RGB. It seems that sence I am not
set the input (camera) profile - then the link is broken.
How does photoshop know its from a Canon 10D ?
Does opening the Raw image in Photshop CS discribe the color as an imbedded input profile would?
What about jpegs? How does photoshop know they are from a
canon 10d with out an input profile?
If I can create a profile for my scanner why not for a digital camera?

I am actually new at this and learning.
Any suggestions would help.

[maderito]

Originally Posted by nworbmit

As an example:
My question is, my canon 10d is churning out untaged images. When I open them in Photoshop CS, they are opened in the default color space - I have set for Adobe RGB. It seems that sence I am not set the input (camera) profile - then the link is broken. How does photoshop know its from a Canon 10D ?

What about jpegs? How does photoshop know they are from a
canon 10d with out an input profile?

If you shoot JPEG's in sRGB, the 10D will tag the image with this ICC profile. The "link" from camera to Photoshop is maintained.

For JPEG's and Adobe RGB, Canon chose to not tag the image. The link is thus broken. You have to tag it yourself. PS only sees the image as "untagged." You can assign the Adobe RGB profile upon loading in PS, after loading, or while saving. The PS "Color Settings" options determine when you are given the choice to tag the file.

Does opening the Raw image in Photshop CS discribe the color as an imbedded input profile would?

RAW images don't have profiles. You assign the profile after conversion from RAW. It's a choice you make in the conversion software interface.

If I can create a profile for my scanner why not for a digital camera

You can. But you have to factor in that cameras take pictures under different lighting conditions. Here's a product review and opinions by Michael Reichmann on camera profiling: http://www.luminous-landscape.com/re...mera-pro.shtml