#38730: octave-devel @3.6.3 GraphicsMagick limits images to 8 bits per pixel ---------------------------+-------------------------------- Reporter: cwr@… | Owner: macports-tickets@… Type: defect | Status: new Priority: Normal | Milestone: Component: ports | Version: 2.1.3 Resolution: | Keywords: Port: octave-devel | ---------------------------+-------------------------------- Changes (by ryandesign@…): * cc: ryandesign@… (added) Comment: Replying to [ticket:38730 cwr@…]:
{{{ warning: your version of GraphicsMagick limits images to 8 bits per pixel }}}
The error message is not correct. GraphicsMagick is not limited to 8 bits per pixel; it is (in its default configuration) limited to 8 bits per pixel ''quantum''. A pixel is made up of four pixel quantums: red, green, blue, and alpha. So the default setting of 8 is 24 bits of color information and 8 bits of alpha. GraphicsMagick also supports pixel quantums of 16 bits (48 bits of color and 16 bits of alpha per pixel) and 32 bits (96 bits of color and 32 bits of alpha per pixel); you can select which one you want by using the appropriate variant when you install the port: {{{ $ port variants GraphicsMagick GraphicsMagick has the variants: q16: Use 16 bits per pixel quantum * conflicts with q32 q8 q32: Use 32 bits per pixel quantum * conflicts with q16 q8 [+]q8: Use 8 bits per pixel quantum * conflicts with q16 q32 universal: Build for multiple architectures }}} -- Ticket URL: <https://trac.macports.org/ticket/38730#comment:3> MacPorts <http://www.macports.org/> Ports system for OS X