Draw a rounded rectangle over an existing image in ImageMagick v6
It is straightforward to draw a filled rounded rectangle in ImageMagick v6:
convert -size 800x600 xc:transparent -fill white -stroke black -strokewidth 20 -draw "roundRectangle 50,100,600,500 32,33" output.png
But how do you draw a rounded rectangle with transparent fill over an existing image? (Only drawing the outside borders, no filling of the insides.)
Input image:
Desired output image:
Solution
Here is how to draw round rectangle on transparency in Imagemagick 6. The draw command has 3 arguments: top-left corner, bottom-right corner, corner radii.
convert -size 500x500 xc:transparent -fill transparent -stroke black -strokewidth 10 -draw "roundrectangle 100,100 399,399 30,30" roundrectangle.png
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