Uses a box filter to downsample the texture

Uses a gaussian filter to downsample the texture

Uses a gaussian filter to downsample the texture, applies border to not oversample edges

Downsamples the texture using a max operator filter ( brightest pixel )

Downsamples the texture using a min operator filter ( darkest pixel )

Downsamples the texture in red and green channels using a Min/Max filter ( darkest and brightest pixel )