PeachImage
PeachImage.Formats.Png.PngAlphaSplitInfo
PngAlphaSplitInfo.ColorIsRgb Property
Whether ColorData holds 3-sample RGB pixels (source color type 6, TruecolorAlpha) as opposed to 1-sample grayscale pixels (source color type 4, GrayscaleAlpha). Meaningless when ColorData is null.
public bool ColorIsRgb { get; init; }