Module dirtyalpha 
Source - bleed_opaque_color ๐ 
 - copy color from opaque pixels to transparent pixels
(so that when edges get crushed by compression, the distortion will be away from visible edge)
 - blur_transparent_pixels ๐ 
 - ensure there are no sharp edges created by the cleared alpha
 - blurred_dirty_alpha ๐ 
 - Clear/change RGB components of fully-transparent RGBA pixels to make them cheaper to encode with AV1
 - chain ๐ 
 - clamp ๐ 
 - premultiplied_minmax ๐ 
 - safe range to change px color given its alpha
(mostly-transparent colors tolerate more variation)
 - weighed_pixel ๐