Re: -

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On Thu, 29 Apr 2010, Agustin Goya | Wancamp wrote:

> Hello everybody, I;m writing because can't find a way to output 12bit t=
iff without alpha.
> I'm using GM to convert some RGB 8 bit to 12bit using the following com=
mand:
> convert File_IN_16bits.tif -type TrueColor -depth 12 File_Out_12bits.ti=
f
> The result is a RGBA 12bit tiff.
> Is there any option to tell GM not to generate an alpha channel like th=
e=A0 "-alpha off" option
> in ImageMagick?

Yes.  Add +matte to the options.  This should also still be supported=20
by ImageMagick.

By the way, you are probably still not getting true 12-bit TIFF.=20
Instead you will be getting 16-bit TIFF contrained to the values that=20
12-bit can support. GraphicsMagick normally tries to avoid writing=20
depths that other software can't read.  If you really want=20
12-bit/sample TIFF, then add this option:

   -define tiff:bits-per-sample=3D12

You need a "Q16" build of GraphicsMagick in order to preserve full=20
quality.

Bob
--
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen=
/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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