mlx.data.Buffer.image_channel_reduction

Buffer.image_channel_reduction(self: mlx.data._c.Buffer, key: str, preset: str = 'default', output_key: str = '') → mlx.data._c.Buffer

Reduce an RGB image to gray-scale with various weights for red, green and blue.

Preset Name	Red weight	Green weight	Blue weight
default/rec601	0.299	0.587	0.114
rec709	0.2126	0.7152	0.0722
rec2020	0.2627	0.678	0.0593
green	0	1	0

Parameters:

• key (str) – The sample key that contains the array we are operating on.

• preset (default|rec601|rec709|rec2020|green) – The preset defining the reduction weights to gray scale.

• output_key (str) – If it is not empty then write the result to this key instead of overwriting key. (default: ‘’)