Modifies saturation and optionally pixelates src, placing the result in
dest. src and dest may be the same pixbuf with no ill effects. If
saturation is 1.0 then saturation is not changed. If it's less than 1.0,
saturation is reduced (the image turns toward grayscale); if greater than
1.0, saturation is increased (the image gets more vivid colors). If pixelate
is TRUE, then pixels are faded in a checkerboard pattern to create a
pixelated image. src and dest must have the same image format, size, and
rowstride.
Modifies saturation and optionally pixelates src, placing the result in dest. src and dest may be the same pixbuf with no ill effects. If saturation is 1.0 then saturation is not changed. If it's less than 1.0, saturation is reduced (the image turns toward grayscale); if greater than 1.0, saturation is increased (the image gets more vivid colors). If pixelate is TRUE, then pixels are faded in a checkerboard pattern to create a pixelated image. src and dest must have the same image format, size, and rowstride.