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I have a TIFF File that has a blue background and an Alpha Channel. I would like to save a PNG File which has the blue background transparent, using the Alpha Channel (because some pixels are not fully transparent)

I use Photoshop CS5 Standard, but I haven't found an option there. I don't want to use the Magic Wand because it struggles with half-transparent pixels and because I do have a perfect Alpha Channel.

Any ideas how this can be done?

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Must the solution be within Photoshop? – hometoast Dec 27 '10 at 14:21
    
@hometoast: No. It's what I use, but if there is a better/easier tool for that, I'm more than happy to use it. – Michael Stum Dec 27 '10 at 14:22
up vote 2 down vote accepted

I read"convert format" and I immediately think Image Magick.

convert input.tiff output.png

it's unlikely that it won't know what to do in your situation.

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That worked, but I had to change the background color from blue to white, otherwise the half-transparent pixels weren't converted properly (they had a blue fringe at the edges) – Michael Stum Dec 27 '10 at 14:33

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