Legacy ImageMagick Discussions Archive

0xffff/0xff = 257
0x10000/0x100=256

Thank you for your quick reply.

bash$ echo "P3 1 1 65535 64192 64192 64192" | convert - -evaluate And 255 -evaluate Multiply 257 -depth 8 -compress None PPM:-|tohex
0
1 1
ff
c0 c0 c0
bash$ echo "P3 1 1 65535 64192 64192 64192" | convert - -evaluate RightShift 8 -evaluate And 255 -evaluate Multiply ...

Hi,

I'd like to convert a 16-bit PPM file to two 8-bit PPM files, one is from MSB 8bits and the other from LSB 8bits.

In the following example I use a bash function, tohex(), which convert decimal numbers into hexadecimal numbers.

bash$ type tohex
tohex is a function
tohex ()
{
perl -nae ...