public void GetIsSrgbColorSpaceDescription()
        {
            PngDirectory  directory  = new PngDirectory(PngChunkType.sRGB);
            PngDescriptor descriptor = new PngDescriptor(directory);

            directory.Set(PngDirectory.TagSrgbRenderingIntent, 0);
            Assert.Equal("Perceptual", descriptor.GetIsSrgbColorSpaceDescription());
            Assert.Equal("Perceptual", directory.GetDescription(PngDirectory.TagSrgbRenderingIntent));
        }