celogeek 2650b926f8
add grayscale mode
it will apply different formula to convert image into grayscale.

it works only if the source is not already in grayscale.

0 = normal
1 = average
2 = luminance
2023-05-05 12:24:12 +02:00
..
2023-05-05 12:24:12 +02:00