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Mattias Malm  
#1 Posted : Sunday, May 7, 2006 4:40:29 PM(UTC)
Mattias Malm

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Joined: 5/4/2006(UTC)
Posts: 17

I need to prepare images for news paper publishing, but have a problem when when using Graphics Mill to convert RGB to grayscale with color management turned on (RGB -> CMYK works perfectly). When using Photoshop to convert RGB (Adobe RGB 1998) to grayscale (ISOnewspaper26v4_gr or fargpressen_v3_grey) the image looks the way it should. Using Graphics Mill to do the same thing gives me a very dark image (see attachment).

Is there a problem with my code, the ICM files or Graphics Mill itself? Any suggestions or solutions would be greatly appreciated.

My code:
// Open image
Bitmap gmTest = new Bitmap(Server.MapPath("/bmc.tmp/Stones.jpg"));

// Turn color management on
gmTest.ColorManagement.ColorManagementEnabled = true;

// Set image ICC profile if it's not embedded
if (gmTest.ColorProfile == null && gmTest.IsRgb)
	gmTest.ColorProfile = new ColorProfile(Server.MapPath("/bmc.dat/tr3/ColorProfiles/sRGB IEC61966-21.icm"));

// Set destination ICC profile
gmTest.ColorManagement.GrayScaleColorProfile = new ColorProfile(Server.MapPath("/bmc.dat/tr3/ColorProfiles/ISOnewspaper26v4_gr.icm"));

// Set transformation intent
gmTest.ColorManagement.TransformationIntent = Aurigma.GraphicsMill.Transforms.ColorTransformationIntent.Perceptual;

// Convert and save
gmTest.ColorManagement.ConvertToContinuous(ColorSpace.GrayScale, false, false);
gmTest.Save(Server.MapPath("/bmc.tmp/Gray.jpg"), new JpegEncoderOptions(90, false));

// Clean up

Mattias Malm

Edit: There was a problem with the attachements, so here is an external link to the files used:

[URL was removed]

[Image was removed]

Edited by user Friday, December 18, 2009 8:32:38 PM(UTC)  | Reason: Not specified

#2 Posted : Monday, May 8, 2006 2:24:10 AM(UTC)

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Hello Mattias,

We are checking the problem and will let you know soon.
Best regards,
Fedor Skvortsov
#3 Posted : Tuesday, May 9, 2006 6:24:26 PM(UTC)

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Could you upload archive with color profiles once again? It seems the current file is corrupted.
Sincerely yours,
Dmitry Sevostyanov

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