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How can I transform two identical Images with a different background color into one without any background color?

Like this:

Source Images

to

enter image description here

closed as off-topic by mattdm, ElendilTheTall, Philip Kendall, NickM, inkista Nov 15 '15 at 15:35

  • This question does not appear to be about photography within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

  • In GIMP you can subtract the images and use result as a mask. – Count Iblis Nov 14 '15 at 17:54
  • But then I'll get no transparency – iBent Nov 14 '15 at 17:58
  • 4
    I'm voting to close this question as off-topic because it is about using graphics editing software in a non-photographic context. – mattdm Nov 14 '15 at 19:01
  • 1
    It can be used as an advanced chromakeying technique which exceeds a static chromakey quality and is usable in object photography. – George Polevoy Nov 14 '15 at 19:26
  • Whilst the specific question is about a graphic image as opposed to a photograph, the principle is still useful to photo editing so closing it as off topic is unfortunate IMHO. – wwkudu Dec 12 '15 at 7:26

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