id	summary	keywords	status	owner	type	priority
2158	Transparency gets lost on conversion from pal8 to yuva*	alpha	open		defect	normal
644	Support gray16a png	png gray16a alpha	open		enhancement	wish
896	ljpeg: support 32bpp RGBA	mjpeg ljpeg alpha	open		enhancement	wish
1750	Prores encoders do not support writing alpha	prores alpha	new		enhancement	wish