On Mon, 2 Feb 2009, Fred Weinhaus wrote:
>> Thanks for the pointer. From what I see there, it seems that IM
>> doesn't support 16-bit grey-scale PNG, which is fine with me since
>> that's not what I wanted anyway.
>
> I forgot to ask, but what Q level of IM are you compiled at. If you
> are using Q8, then you won't get 16-bit pngs. You need to have Q16 IM
> to get 16-bits per channel.
I do have Q16. I did some variants of the 'convert gradient:' commands
in your other message and got both 8-bit and 16-bit grey-scale PNG's.
It seems that the statement
To force the use of an single 8bit greyscale channel use either
convert input.jpg -type Scale gray.png
convert input.jpg -type GrayScale gray.png
at http://www.imagemagick.org/Usage/formats/#png_formats
is incorrect.
But I still don't know how to change my 12-bit pixels to 8 bits :-(
- Robert
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