Fixed two bugs when converting pixel to color

rokka-io / imagine-vips

libvips adapter for php imagine

https://rokka.io

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Closed chmgr closed 2 years ago

chmgr commented 2 years ago

alpha has to be 100 (opaque) if image has no alpha channel but palette supports alpha
For grayscale images, alpha channel was taken from non-alpha channel. This also caused an "index out of range" error for grayscale images without alpha channel.

chregu commented 2 years ago

Looks good to me, thanks. Merged