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jcl  
#1 Posted : Monday, September 20, 2004 6:32:00 AM(UTC)
jcl

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Joined: 5/27/2004(UTC)
Posts: 7

I am trying to get color management (a proof preview in this case) to work and can't seem to do it. I am loading an RGB tif graphics file with no embedded color profile as a 32bppArgb bitmap. The code that I am using for profing is:

Code:
   bitmap.Data.ColorManagement.Isnabled = False
   bitmap.Data.ColorManagement.RgbProfile = path\AdobeRGB1998.icc
   bitmap.Data.ColorManagement.Targetprofile = path\FargoProL.icm
   bitmap.Data.ConvertTo24bppRgb True, ColorWhite
   bitmap.DrawOnHdc ...


the image looks the same whether the Color Management conversion is done or not. If I use the above two profiles in Adobe Photoshop and do a proof, there is a noticable difference. The FargoProL.icm is a CMYK printer profile and the AdobeRGB1998.icc is an RGB color profile. Any suggestions.

Edited by user Monday, December 24, 2007 4:47:04 PM(UTC)  | Reason: Not specified

Andrew  
#2 Posted : Monday, September 20, 2004 9:47:00 PM(UTC)
Andrew

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IsEnabled property must be set to True.

Besides, make sure if DataProfile is initialized too (if it is empty string, no profile is attached).

Please let me know if you need a code sample.
jcl  
#3 Posted : Monday, September 20, 2004 10:34:00 PM(UTC)
jcl

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Joined: 5/27/2004(UTC)
Posts: 7

I had tried setting IsEnabled to true as well as setting the DataProfile field with the same results (no noticable change). So a code sample would be appreciated.
Thanks
Andrew  
#4 Posted : Tuesday, September 21, 2004 12:59:00 PM(UTC)
Andrew

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The code should be looking something like that:

Code:
    Dim objBitmap As New Bitmap
    objBitmap.LoadFromFile "c:\input.tif"

    ...

    ' Verify DataProfile. If you are sure that it always has embedded profile,
    ' you can omit this.

    ' Verify DataProfile
    If objBitmap.Data.ColorManagement.DataProfile = "" Then
        If objBitmap.Data.IsRgb Then
            objBitmap.Data.ColorManagement.DataProfile = "c:\DefaultRgbProfile.icc"
        ElseIf objBitmap.Data.IsCmyk Then
            objBitmap.Data.ColorManagement.DataProfile = "c:\DefaultCmykProfile.icc"
        Else ' if bitmap is grayscale
            objBitmap.Data.ColorManagement.DataProfile = "c:\DefaultGrayscaleProfile.icc"
        End If
    End If
    
    objBitmap.Data.ColorManagement.IsEnabled = True 
    objBitmap.Data.ColorManagement.RgbProfile = "C:\NecessaryRgbProfile.icm"
    objBitmap.Data.ColorManagement.TargetProfile = "C:\IntermediateProfile.icm"
    objBitmap.Data.ConvertTo24bppRgb

    ...

    objBitmap.SaveToFile "c:\output.tif"


I just tried this code and here are the results:

objBitmap.Data.ColorManagement.IsEnabled = True
UserPostedImage

objBitmap.Data.ColorManagement.IsEnabled = False
UserPostedImage

If you still has problems with it, please submit case with the input file and the profiles you are trying to use.

Edited by user Monday, December 21, 2009 3:25:31 AM(UTC)  | Reason: Not specified

Andrew attached the following image(s):
GraphicsMill_1216_ColorManagementOn.JPG
GraphicsMill_1216_ColorManagementOff.JPG
jcl  
#5 Posted : Thursday, September 23, 2004 9:54:00 AM(UTC)
jcl

Rank: Member

Groups: Member
Joined: 5/27/2004(UTC)
Posts: 7

I finally found my problem. I am working in 32bppArgb space and the color management doesn't seem to "take" if I apply it directly. However, if i first convert to 24bppRgb and then apply the color management, it works.

Could you tell me when you do the conversions, what algorithm do you use, Relative Colormetric, Perceptual, Saturation, Absolute Colormetric, something else. Also if a rendering method/intent is in the color profile does it overide your default?

Thanks
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