This one time, at band camp, Peter Rundle wrote:
> Does anyone know of a simple cmd-line utility that can remove the alpha
> channel from a .png?
man pngtopnm
These two switched look like they'll do what you want. Kinda crappy
that it doesn't support alpha channels!
-mix Compose the image with the transparency or alpha mask against a
the background. When a background chunk is available that color
is taken, else black will do.
-background color
If no background color chunck is present in the png-file, or
when another color is required this parameter can be used to set
the background color of images. This is especially useful for
alpha-channel images or those with transparency chunks. The for‐
mat, to specify the color in, is either (in the case of orange)
"1.0,0.5,0.0", where the values are floats between zero and one,
or with the syntax "#RGB", "#RRGGBB" or "#RRRRGGGGBBBB" where R,
G and B are hexa-decimal numbers.
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