Faxes use the CCITT Group 3 protocol. They support 2 resolutions: 203 by 98 dpi and 203 by 196 dpi. So, the code you listed will need to be modified slightly to accommodate different resolutions in the x and y axis. Here is a detailed description of the fax protocol.

In reply to Re: Re: PerlMagick: How to Calculate an image size in milimiters? by ehdonhon
in thread PerlMagick: How to Calculate an image size in milimiters? by monsieur_champs

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