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ColorProfile disappears when using DiscardAlpha()
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Joined: 5/4/2006(UTC)
Posts: 17
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Since JPEG images don't support alpha channel, and simply saving an image with alpha as JPEG results in a blend to black, I would like to use DiscardAlpha() to blend the image to white before saving it as JPEG. The blending works great, but every time i use DiscardAlpha() the ColorProfile property is set to NULL and the JPEG file doesn't have the assigned profile embedded. Is there a reason for this, is it a bug or am I doing something wrong? Sample code (c#): Code:// Open image
Bitmap gmImage = new Bitmap(Server.MapPath("RgbFileWithAlpha.psd"));
// Turn color management on
gmImage.ColorManagement.ColorManagementEnabled = true;
// Set transformation intent
gmImage.ColorManagement.TransformationIntent = Aurigma.GraphicsMill.Transforms.ColorTransformationIntent.Perceptual;
// Set default ICC profile if it's not embedded
if (gmImage.ColorProfile == null && gmImage.IsRgb)
gmImage.ColorProfile = new ColorProfile(Server.MapPath("ColorProfiles/sRGB IEC61966-21.icm"));
// Set destination ICC profile and convert
gmImage.ColorManagement.RgbColorProfile = new ColorProfile(Server.MapPath("Adobe RGB (1998).icm"));
gmImage.ColorManagement.ConvertToContinuous(ColorSpace.Rgb, gmImage.HasAlpha, false);
// Save file in correct format
if (gmImage.HasAlpha)
gmImage.Channels.DiscardAlpha(Aurigma.GraphicsMill.Color.FromRgb(255, 255, 255));
gmImage.Save(Server.MapPath("NewFile.jpg"), new JpegEncoderOptions(90, false));
// Clean up
gmImage.Dispose();
Edited by user Wednesday, December 19, 2007 4:18:43 PM(UTC)
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Rank: Advanced Member
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Joined: 8/3/2003(UTC)
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Hello, We confirm the problem - thanks for report. This problem will be resolved in the next version of Graphics Mill for .NET. At this moment you can use the following workaround: Code:Aurigma.GraphicsMill.ColorProfile profile = bmp.ColorProfile;
bmp.Channels.DiscardAlpha();
bmp.ColorProfile = profile;
Edited by user Wednesday, December 19, 2007 4:18:56 PM(UTC)
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Rank: Member
Groups: Guest
Joined: 5/4/2006(UTC)
Posts: 17
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Thanks for the confirmation. I've already tried solving the problem the way you suggested, but it seems that DiscardAlpha() releases all profile resources, including the . I get this error message: Unable to open color profile 'C:\WINDOWS\TEMP\ICM13B0.tmp'. I assign the original profile to the image from disk after using DiscardAlpha(), so the resulting file is correct now.
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Rank: Advanced Member
Groups: Guest
Joined: 8/3/2003(UTC)
Posts: 1,070
Thanks: 1 times
Was thanked: 12 time(s) in 12 post(s)
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Sorry, here is correct workaround: Code:Aurigma.GraphicsMill.ColorProfile profile = bmp.ColorProfile != null ? new Aurigma.GraphicsMill.ColorProfile(bmp.ColorProfile.FileName) : null;
bmp.Channels.DiscardAlpha();
bmp.ColorProfile = profile;
Edited by user Wednesday, December 19, 2007 4:19:11 PM(UTC)
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ColorProfile disappears when using DiscardAlpha()
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