Covert 16-bit pgm to 16-bit JPEG

[jackhab]

Is it possible to covert 16-bit pgm to 16-bit JPEG? I converted pgm to 16-bit tiff, but when I tried to converted to jpg ImageMagick creates 8-bit image.
I use 16-bit version 6.4.0.3.

Thanks.

[fmw42]

If it does not do it automatically, then try adding -depth 16

convert image.pgm -depth 16 image.jpg

See if that works.

[magick]

JPEG supports 8 and 12 bit images. However, you have to enable 12-bit support when you build the JPEG delegate library before 12-bit JPEG images can be written with ImageMagick.

[jackhab]

JPEG supports 8 and 12 bit images. However, you have to enable 12-bit support when you build the JPEG delegate library before 12-bit JPEG images can be written with ImageMagick.

I've never compiled ImageMagick. Would you, please, give me some details on that?

I managed to get 24-bit jpeg with

Code: Select all

-depth 24 -type truecolor

but it seems to simply ignore when I request the depth of 12.

[magick]

ImageMagick cannot create 12-bit JPEG images until the JPEG delegate library is first compiled with 12-bit support (the default is 8-bit). To compile ImageMagick from source see http://www.imagemagick.org/script/install-source.php.