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luvain  
#1 Posted : Sunday, August 15, 2021 5:49:57 PM(UTC)
luvain

Rank: Newbie

Groups: Member
Joined: 8/15/2021(UTC)
Posts: 2

Dear sir,

I add one extra channel in the tiff image according to the extra channels example in github, but seems the extra channel is an alpha channel and how to change it into a real sopt color channel.
What I really want is the image can be opened in photoshop and view 5(cmyk+spot) channel and the last channel is a sopt channel in photoshop.
Thanks in advance!

Edited by user Sunday, August 15, 2021 6:15:28 PM(UTC)  | Reason: Not specified

luvain  
#2 Posted : Sunday, August 15, 2021 6:12:57 PM(UTC)
luvain

Rank: Newbie

Groups: Member
Joined: 8/15/2021(UTC)
Posts: 2

By the way, the extra bitmap is a gray8 bitmap.

var extraChannel = new TiffExtraChannelEntry(bitmap, TiffChannelType.Color);
writer.ExtraChannels.Add(extraChannel);
Pipeline.Run(reader + writer);

Edited by user Sunday, August 15, 2021 6:13:30 PM(UTC)  | Reason: Not specified

Eugene Kosmin  
#3 Posted : Thursday, August 19, 2021 1:40:27 AM(UTC)
Eugene Kosmin

Rank: Advanced Member

Groups: Member, Administration, Moderator
Joined: 9/19/2006(UTC)
Posts: 478

Was thanked: 30 time(s) in 30 post(s)
Hi,

Check the following code.

It produces a TIFF with one extra channel. Photoshop shows it as a separate channel.

Code:
using (var src = new Bitmap(300, 300, PixelFormat.Format32bppCmyk, RgbColor.White))
using (var writer = new TiffWriter("out.tif"))
{
    using (var extraBitmap = new Bitmap(src.Width, src.Height, PixelFormat.Format8bppGrayscale, RgbColor.White))
    {
        var extraChannel = new TiffExtraChannelEntry(extraBitmap, TiffChannelType.Color);

        writer.ExtraChannels.Add(extraChannel);
        Pipeline.Run(src + writer);
    }
}
Best regards,
Eugene Kosmin
The Aurigma Development Team
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