Legacy ImageMagick Discussions Archive

Hello,
I am working with Imagemagick from powerpoint.
The problem I have is that I select a shape, say a disc for example nothing special. It has a transparent background.
I copy the shape and then ask ImageMagick to create a shadow using "clipboard:" as the source.
The problem is Imagemagick doesn't "see" the transparency and gives me a square shadow everytime.

By the way, I am having Imagemagick giving only the shadow back, so I don't do anything like flattening.
Also, if I export the shape as a png and work from there my code works perfectly, but from the clipboard, it works but no transparency.

I try to use api function to control the format in the clipboard but I am going nowhere. if anybody has any idea???

Any help would be much appreciated. Many thanks in advance.

pardon my ignorance, but how do you tell command line IM to use the clipboard as input?

can you modify the read of the clipboard by telling it -channel rgba -alpha on to get the transparency?

Hello. To use the clipboard, as the source for my "convert" command, instead of myimage.png (an example) I use "clipboard:".
I found it in the Imagemagick doc.

As for your suggestion, thank you very much. I will try.

hello again,
i tried your suggestion -channel rgba -alpha and it didn't work. Obviously Imagemagick sees the image in the clipboard as opaque.

so the clipboard is only for Windows?

did you put -channel rgba -alpha before clipboard: or after?

Sorry I don't know much about systems others than windows but I assume "clipboard:" refers to whatever memory is used when you copy something.

I put -channel rgba -alpha after "clipboard:" as I assumed we should always start with the source. But maybe I was wrong. I'll try and see what happens.