PeachImage
PeachImage.Formats.Jpeg.JpegDecoderOptions
JpegDecoderOptions.DecodeRawYcck Property
When true and the source is really YCCK under the hood (IsYcck), the four raw, interleaved, unconverted planes are returned as Ycck32 instead of the default behavior of converting them to Cmyk32. Has no effect when the source isn’t YCCK.
public bool DecodeRawYcck { get; init; }