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    $\begingroup$ I have tested rasterizeBackground[f21rand] but the output is the function without evaluation i.e. out[73]= rasterizeBackground[theImage, 425]. Please, can you tell me what am I doing wrong? Thank you very much. $\endgroup$ Commented Aug 11, 2017 at 11:06
  • $\begingroup$ Did you also add the original definition of rasterizeBackground? $\endgroup$ Commented Aug 11, 2017 at 11:20
  • $\begingroup$ Yes, the function is evaluated before of this new one $\endgroup$ Commented Aug 11, 2017 at 11:20
  • $\begingroup$ Do I have to make Clear befor using rasterizeBackground?. I have made the clear but still is not giving an output with a image. Thank you very much for your help. $\endgroup$ Commented Aug 11, 2017 at 12:35
  • $\begingroup$ You should not have to use Clear in theory... I updated the answer with a fully working example, can you check whether that works for you? $\endgroup$ Commented Aug 11, 2017 at 12:55