Thanks. I gave it a try and switched from using a file handle to using just a file name and still get an an error, albeit a different one:

Error b: Exception 430: unable to open file '/tmp/magick-K306MFDJ8ArD4Ytnu0O7O3MOC9CghbHa': No such file or directory @ error/constitute.c/ReadImage/785

I'm not creating any temporary files there, so it must be the module which is trying to do that. It looks like the temporary file vanishes before it is used.

In reply to Re^2: Image::Magick - Exception 435: unable to open file `Image::Magick::Q16' @ error/Q16.xs/XS_Image__Magick__Q16_Read/13529 by mldvx4
in thread Image::Magick - Exception 435: unable to open file `Image::Magick::Q16' @ error/Q16.xs/XS_Image__Magick__Q16_Read/13529 by mldvx4

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