How to replace a specific color in a picture with a transparent one?

Update

Yes, using php. There are 2 pictures. One ordinary, the second - with a mask (diamond, transparent center). In the toga after gluing it turns out . How to remove white color and make it transparent?

  • 3
    Are you going to do this using php? - alvoro
  • So the shirt is also white. And it will also become transparent. - dlarchikov
  • Yes, it will become transparent) The color may be black, blue ... But this is not the point, but how to replace the place of a certain color with a transparent one) - kotdg

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