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How do I change the Dpi of an image without loading a bitmap?
Rank: Advanced Member
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Joined: 5/10/2017(UTC)
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Hello, to process a large image I need to use a pipeline. The Dpi can only be set for a bitmap or an imagegenerator. I came up with the following so far: Code:using (var reader = ImageReader.Create(@"..\largeinput.tif")
using (var generator = new ImageGenerator(reader, RgbColor.White)
using (var combiner = new Combiner(CombineMode.AlphaOverlay, reader))
using (var writer = new TiffWriter(@"..\output.tif");)
{
generator.DpiX = 123;
generator.DpiY = 123;
Pipeline.Run(generator + combiner + writer);
}
The use of an imagegenerator also implies the use of a backgroundcolor, which I have to get from the readers bitmap again (because of Code:bitmap.ColorManagement.BackgroundColor;
beeing the only source of a background color). I wonder wether there is a easier way to assign Dpi.  Edited by user Friday, May 12, 2017 4:09:55 AM(UTC)
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Rank: Advanced Member
Groups: Member, Administration, Moderator
Joined: 7/28/2003(UTC)
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You can use the ResolutionModifier class to change resolution: Code:using (var reader = ImageReader.Create(@"..\largeinput.tif"))
using (var resolutionModifier = new ResolutionModifier(123, 123))
using (var writer = new TiffWriter(@"..\output.tif"))
{
Pipeline.Run(reader+ resolutionModifier + writer);
}
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Best regards, Fedor Skvortsov |
 1 user thanked Fedor for this useful post.
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Rank: Advanced Member
Groups: Member
Joined: 5/10/2017(UTC)
Posts: 33
Thanks: 10 times
Was thanked: 1 time(s) in 1 post(s)
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 Thanks, that does it. I totally didn't fint that one between the rest.
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Aurigma Forums
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How do I change the Dpi of an image without loading a bitmap?
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