Legacy ImageMagick Discussions Archive

Hi,

I've searched the web and documentation at length looking for an answer to this, but I haven't been able to find an answer that fits exactly.

I'm wondering if it is possible with 7.0.4-0 Q16 x64 (or any other version of IM) to set a specific color to a percentage of transparent (or opaque, I suppose)? This would be so that I could do a gradient fade to transparent at the same time it fades in color.

Imagine an eps with solid black lines and a white background. I'm converting them to png's where white needs to be fully transparent and black fully opaque. No problem, except -

Now imagine that some of these images have a round gradient in them somewhere that fades from black to white (looks like a 3D ball.) Can I set the various intermediate colors in the gradient to percentages of transparent? Something like this (which I know isn't valid), for example?

-transparent #cccccc 50% -transparent #fefefe 10% etc.

Or is there a more simple or direct way to do it that I've totally missed?

Thanks!
cfredman

You can clone the image and copy the opacity. Then any pixels that were black will become transparent, white will remain opaque, 25% gray will be 25% opaque, etc.

Sweet! I will give that a try.

Thanks!

Sorry, I've just noticed: "white needs to be fully transparent and black fully opaque". So you'll need to negate: