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Gamma or brightness appears wrong after encoding. #11

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HSGorman opened this issue Jul 19, 2016 · 3 comments

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@HSGorman
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commented Jul 19, 2016

Using the following code to convert a jpg to a jp2. When I read the jp2 the image appears too light (brightness or gamma appear to be off). Any ideas?

BitmapImageCreator.Register();
using (var bitmap = (Bitmap)Image.FromFile(@"C:\temp\jp2\llb.jpg"))
{
var enc = J2kImage.ToBytes(bitmap);
File.WriteAllBytes(@"C:\temp\jp2\llb.jp2", enc);
}

@anders9ustafsson

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commented Jul 22, 2016

@HSGorman Many thanks for reporting! Could you please include a sample image with this problem?

@anders9ustafsson

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commented Mar 17, 2017

@HSGorman Could be related to the failure to properly display the logo (file14) in codectest. But it would be good to have the sample as well.

@tomerinb

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commented Jul 14, 2019

same here.
got a very bright an contrasted image after converting to jp2.
is there a fix?
i attached the sample (original file and converted one)

here is the code i used:
System.Drawing.Image image = System.Drawing.Bitmap.FromFile("c:\img.jpg");
byte[] j2kArray = CSJ2K.J2kImage.ToBytes(image);
File.WriteAllBytes("c:\newImage.jp2", j2kArray);

Images.zip

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