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I have a GIF file that has a transparent section. I want to replace that with just plain white (or some other colour), so that there is no transparent parts. Can I do this on the command line with ImaageMagick? I'm OK if the image has to change from a .gif to something else. I tried to convert it to a jpg and the tramsparent parts were black. Is there a way to customize that?

I'm using ImageMagick on Ubuntu 9.10 Karmic Koala

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up vote 9 down vote accepted

You can do this using the 'convert' binary that comes with imagemagick.

convert myimage.gif -alpha off myimage.gif

Read about setting it to a custom color here: http://www.imagemagick.org/Usage/formats/#gif_trans

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