Add dynamically frames to images

Question

On a web server running PHP I have images like that:

To which I have to add frames like that:

I think it's quite complex, because images won't have the same ration (width/height), there is a shadow on the Mat which can be modified to change the color or can be removed.

I know how to play with php image GD library and I could easily add some watermarks on images but I don't know which tool I should use to generate dynamically a frame.

Maybe ImageMagick or I was thinking about Gimp bach mode. Which tool would you advise me?

Answer 1

Yes you can do it with Imagemagick: https://www.imagemagick.org/Usage/thumbnails/#frame_edge

You just need to do the calculations and use them to create the dimensions etc. from the original image.

It gets quite complicated to work out at the start.

EDIT: This has a smaller shadow on the matt ( my personal preference ) but I did it with Imagemagick and php ( note Stackoverflow has changed it to a jpg so it has lost the background transparency ):