How can I stretch the edge colors of elements in an image with alpha channel?
I have an PNG with an alpha channel. First I want to find all elements in the png, then I want to stretch the last color on the border about 5 to 10 pixels out
The stretching has to be in all directions from the center of each object on the image (like triangle, rectangle...)
It is important that I keep the color of each pixel on the edge
Is this possible? Goal is in the future to automate the process with ImageMagick.
I have had a play with distort and it is probably the way to go but needs more investigation. I was working on a smaller image and the code is basically a proof of concept.
I think edge is the key option and with this example I reduced the size of the resized image all round by 20px in the distort. I do not know how you would get the angled edges though.I know you do not want to distort the original but it may give you some ideas as to how to get the result you want.
convert "1.png" -trim -matte -virtual-pixel edge -mattecolor none -interpolate Spline +distort BilinearForward "0,0 20,20 400,0 380,20 400,95 380,55 0,95 20,55" -trim +repage "result.png"
