RGB Setup – Clarification

PD
Posted By
Peter Detheridge
Jul 20, 2003
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565
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I previously sent this but forgot to to indicate I am using PS7 on PC.

I am not understanding colour workspaces. Especially RGB setup. In some graphics applications you can define a work flow from scanner to monitor to printer each may have their own ICC profile. In Photoshop 7 I get to to pick one for everything it seems.

I scan most of my images with HP Scanjet 3C (has specific ICC profile) and print on HP5550 (HP recommends the device independent sRGB profile). Should I set RGB profile to suit my scanner or to the device independent sRGB?

Any advice will be gratefully received.
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Tom Thackrey
Jul 20, 2003
On 19-Jul-2003, "Peter Detheridge" wrote:

I previously sent this but forgot to to indicate I am using PS7 on PC.
I am not understanding colour workspaces. Especially RGB setup. In some graphics applications you can define a work flow from scanner to monitor to
printer each may have their own ICC profile. In Photoshop 7 I get to to pick one for everything it seems.

I scan most of my images with HP Scanjet 3C (has specific ICC profile) and print on HP5550 (HP recommends the device independent sRGB profile). Should
I set RGB profile to suit my scanner or to the device independent sRGB?

Workspaces are different from color profiles. The ICC profile is device/paper/ink dependent and is used to attempt to render accurate colors on that device. The color workspace is a device independent mapping of the pixel values in the image file to specific colors. AdobeRGB, for example, has a bigger color space than sRGB, that means that you can represent a wider range of colors with the AdobeRGB workspace. (Bigger is not always better because a given printer may not be able to render all the colors in a particular color space.

I suggest further reading:
http://www.computer-darkroom.com/ps7-colour/ps7_1.htm
http://www.outbackphoto.com/color_management/cm_01/essay.htm l

—
Tom Thackrey
www.creative-light.com

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