[MacPorts] #38730: octave-devel @3.6.3 GraphicsMagick limits images to 8 bits per pixel

[MacPorts]

#38730: octave-devel @3.6.3 GraphicsMagick limits images to 8 bits per pixel
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  Reporter:  cwr@…         |      Owner:  macports-tickets@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:                |   Keywords:
      Port:  octave-devel  |
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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>
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