How to create a semi transparent shape??

I would like to know how to draw semi-transparent shapes in OpenCV, similar to those in the image below (from http:/...

Apply gradient mask on image that already has transparency with ImageMagick??

I've got a PNG image with transparency: original.png Now I want to use ImageMagick to apply a diagonal gradient t...

How to create transparent activity in android??

How to create transparent activity in android in that screen tap to dismiss button automatically dismiss the activi...