PngBitDepth.Bit8 not work, image still bit32

[df257]

This is my code:

using(SixLabors.ImageSharp.Image image = SixLabors.ImageSharp.Image.Load(@"E:\c#\WindowsFormsApp1\bin\Debug\test.png")) {
    SixLabors.ImageSharp.Formats.Png.PngEncoder pngEncoder = new SixLabors.ImageSharp.Formats.Png.PngEncoder();
    pngEncoder.CompressionLevel = SixLabors.ImageSharp.Formats.Png.PngCompressionLevel.Level5;
    pngEncoder.BitDepth = SixLabors.ImageSharp.Formats.Png.PngBitDepth.Bit8;
    image.SaveAsPng("test2.png", pngEncoder);
}

[JimBobSquarePants]

PngBitDepth is calculated at bits per sample or per palette index (not per pixel). This is inline with the specification. To set your colorspace you also need to set the PngColorType property.

This issue would have been better suited as a QA discussion and as such I've transferred it.