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The image is generated by the code below:

img = ExampleData[{"TestImage", "House"}];
ImageTransformation[img, If[Norm[# - 0.5] < 0.5, #, {-0.1, -0.1}] &]

enter image description here

How can I set the background from black to white, and it will only be applied on the region out of the disk?

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  • 1
    $\begingroup$ add the option Padding -> 1? $\endgroup$ – kglr Dec 18 '18 at 2:46
  • $\begingroup$ That works! thanks! $\endgroup$ – leon365 Dec 18 '18 at 2:47
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ImageTransformation[img, If[Norm[# - 0.5] < 0.5, #, {-0.1, -0.1}] &, 
 Background -> White, Masking -> All]

enter image description here

Alternatively,

ImageTransformation[img, If[Norm[# - 0.5] < 0.5, #, {-0.1, -0.1}] &, Padding-> 1]

enter image description here

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