Converting a DCX page to PNG results wrong color

[victor8hpy]

Magick.NET version

MagicK.NET-Q16-AnyCPU v14.10.3

Environment (Operating system, version and so on)

Windows 11

Description

I try to convert a DCX page 0, to a PNG image. The converted PNG shows bad color.

Steps to Reproduce

using ImageMagick;

namespace DcxToPng
{
internal class Program
{
static void Main(string[] args)
{
var inputFilePath = @"C:\Temp\Input\DCX1.DCX";
var outputFilePath = @"C:\Temp\Output\DCX1.png";

        using MagickImageCollection collection = new(inputFilePath);

        collection[0].Write(outputFilePath, MagickFormat.Png);
    }
}

}

Run the above console application, using the following DCX1.DCX from zip file.

DCX1.zip

Images

Bad result:

Good as it should be:

[dlemstra]

Thanks for reporting this. I just pushed a patch to the ImageMagick repository to fix this. The image was using the wrong color map. This fix will become available in the next release.

[victor8hpy]

Thanks @dlemstra for the update. In the DCX file I provided, there are 3 pages. The other 2 pages are black white images. However they are shown color-inverted. Can you please check if your change fix them as well?

[dlemstra]

The second one is black and white but the third one is a color image? What should they look like according to you?

[victor8hpy]

Sorry my mistake. The 3rd one is a color image. It should be fine with or without your fix. The 2nd one is black/white. But looks like the black and white are inverted.

2nd Should be:

2nd Bad one as it shows now:

The 3rd one should look like: