struct { unsigned_32bit x_res; /* 1st four bytes; big endian */ unsigned_32bit y_res; /* 2nd four bytes; big endian */ } Sets the send fax resolution. The x and y resolutions in this object are in fixed-point with 16 bits of fraction, and 16 bits of integer, and are in dots per inch. X is horizontal; Y is vertical. Examples of computing x_res and y_res: 300 dots/inch:round(300 * 65536) = 19660800 16 dots/mm: round(16 * 25.4 * 65536) = 26633830. If the device does not support the given combination, then it'll select the nearest supported values in a device-dependent manner (documented in the POS). Additional information: HP Laserjet 3200 supports 4 fax resolutions. As far as the end-user is concerned these resolutions are: standard, fine, superfine, and photo. Photo is not really a resolution Resolutions map as follows (values are given in dots per inch (dpi) horizontal X vertical (x X y)): standard(203 X 98), fine(203 X 196), superfine(300 X 300), and photo(300 X 300). Supported resolutions in hex notation (dpi, x X y) are: standard(00cb0000 X 00620000), fine(00cb0000 X 00c4000), superfine(012C0000 X 012C0000), and photo(012C0000 X 012C0000). The device ignores attempts to set invalid resolutions. Photo is not a resolution, but photo setting depends on whether half-toning is on or off. In the case of HP Laserjet 3200 photo setting doesn't actually change the bits going out the modem superfine are the same. NOTE: The last 16 bits of the horizontal and vertical settings are ignored. Only the first 16 bits of the horizontal and vertical resolution setting are used.