How to add transparency

[anshupitlia]

I have to create an image, which is an overlay texture made up of a white image with some transparency to give it the appearance of a rubber stamp. For reference see the image "stamp_overlay.png" in the video http://railscasts.com/episodes/374-image-manipulation .

This is what i did:

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convert -size 70x70 canvas:white stamp_overlay1.png

and then

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convert stamp_overlay1.png -transparent white stamp_overlay1.png

But how do I give a rubber stamp effect?


I am pretty much new to ImageMagick. Any help is highly solicited. Thanks

[snibgo]

As you see in the video, convert needs an input and an output. Your second command has no output.

[atariZen]

That's a useful video, but it's incomplete because the instructor does not say how to create the stamp_overlay1.png. That file came out of nowhere. Anyone else encountering this thread will want to see this thread:

viewtopic.php?f=1&t=20080

That includes how to make ImageMagick do the work to derive the rubber stamp effect.