Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
The composite is putting into play the blur from the first of the two images.
The blur should affect only the mask, each pixel of which becomes either black or transparent. The receipts shouldn't be blurred. If one is, please provide an example.
You can find what trim has done by omitting "+repage" and examing the output from identify.