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There are several ways to specify a custom variable name and override default settings while exporting a C-style header file in ImageMagick:

1. Use the -define flag to specify a variable name:

magick image.jpg -define h_output=my_image_data file.h

This will export the image data to a header file called file.h, with the variable name myimagedata.

1. Use the -verbose flag to override default settings:

magick image.jpg -define verbose=true file.h

This will export the image data to a header file called file.h, with verbose output.

1. Use both methods together:

magick image.jpg -define h_output=my_image_data -define verbose=true file.h

This will export the image data to a header file called file.h, with the variable name myimagedata and verbose output.