[thelist] ImageMagick and convert
Bob Meetin
ontheroad at frii.com
Mon Oct 2 16:39:06 CDT 2006
I use the convert option ImageMagick (on a linux server) to
increase/decrease the compression of uploaded files. For instance if a
client uploads a 500KB file, I use convert to make it a lighter file.
I'm coupling that with a php while loop to keep checking the file size,
and once it reaches, say 50K, it will break out.
The code is:
$make_file = system("convert $file -density 72x72 -quality 100
'$newfile'", $retval);
The command seems to work, but I don't understand the results. At best
I would expect quality of 100(%) to get me an image about the same size
as the original, but no, it is approximately double, turning a 182k
image into 406k. Adjusting to 50(%) results in 94k and 30(%) results in
69k with 10% to 35k and a worthless file.
What am I missing, why does 100% more than double the file size?
-Bob
More information about the thelist
mailing list