Calibration problems

M
Posted By
MBoothe
Nov 24, 2003
Views
239
Replies
5
Status
Closed
I’m using PS 7.01 in Windows XP.

I have a Samsung 170N LCD. I used its color calibration utility and did not use Adobe Gamma. In Windows, preview of a file appear as it should but as soon as I open it in Photoshop, the image looks completely different, specifically it is very much darker. I realize that colors may not be accurate on LCD, but shouldn’t they be consistent in both Photoshop and Windows Preview or desktop, e.g.?

To disable Adobe Gamma, do I have to do anything other than remove shortcut from Startup menu?

I also see discussion of Ignore EXIF for digital cameras. I use Nikon Coolpix 990 which says embedded profile is sRGB IE61966-2.1. I’ve been converting it to my working profile. Could this be involved in this issue as well? (Color change still there even if profile discarded and converted to Adobe sRGB.)
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L
LenHewitt
Nov 24, 2003
MB,

as soon as I open it in Photoshop, the image looks completely different,
specifically it is very much darker.<<

Normal. Outside of PS you are viewing in a non-colour managed environment. Within PS you are viewing within a colour managed environment, so within PS the colour you see will be dependent not only upon the monoitor profile, but also upon any embedded colour profile (or colour space stated in the EXIF data), your working space profile and how you have setup PS to handle profile mismatches.
M
MBoothe
Nov 25, 2003
Supposedly Samsung color calibration is in effect before I even use Photoshop. (I can see color change on desktop as system starts.) So wouldn’t that mean the system is being color manged? Do I need to specifically tell Photoshop which monitor profile to use?

I guess I need to follow up this with Samsung.
L
LenHewitt
Nov 25, 2003
MB,

It’s not a case of the monitor profile – it’s the fact that Photoshop reads any colour profile meta data within a file and uses its Colour Management System to display the INTENDED colour values according to that profile. Maybe the following will help:

The numbers in an image file do not represent specific colours. For example, 100R, 0G, 0B just means "make the brightest, most saturated red you can". It doesn’t mean a specific SHADE of red, and the red that will result will depend upon the capabilities of the device the data is being sent to (usually either a monitor or printer of some sort).

Only when coupled with an ICC profile that descibes the ‘colour space’ do those numbers represent a specific shade.

If it helps you in any way here is my short "idiot’s guide to CM" <g>

There is data in a file. That data doesn’t represent specific colours UNTIL the colour space is stated (embedded profile or assign profile).

The working profile sets up the colour space you are working in, and the embedded profile allows the CM engine to convert the file data values to your working space values so those values still represent the same colour as originally indicated by the file data and embedded profile.

The monitor profile alters that data from your working space on the fly to allow the monitor to display the colours represented by the data within the working space profile.

When you print, the output profile alters the data to allow the printer to reproduce the colours represented by the data and the image profile.

The monitor profile effectively drops out of the equation when you print.

Provided the ‘translation’ from working space to monitor is correct AND the translation from working space to output device is correct, the print will match the monitor.

However, only if the translation from embedded profile to working space is also correct will the monitor and print also match the original file intentions.

For a fuller explanantion, spend some 15 minutes or so over at http://www.computer-darkroom.com
GH
Gernot_Hoffmann
Nov 25, 2003
Mboothe,

it´s necessary to assign in Display Setup one of the existing monitor profiles as the "default monitor profile". The default monitor profile is used for the conversion of working space data to monitor data (e.g. in PhS).

One cannot be sure that a program or instrument software does this assignment automatically.

Best regards –Gernot Hoffmann
M
MBoothe
Nov 25, 2003
Thank you. This is what I have to talk to Samsung about because supposedly I’ve assigned a profile called user1 to my monitor yet the associated profile in the monitor settings says sm170. Hopefullly asigning user1.icm to it will fix my problem.

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