Legacy ImageMagick Discussions Archive

I need to convert some tiff images with Group4 compression, and scale the image to fit 5800*5800.

I did this....

$x = $image->Set(compression=>'Group4');
warn "$x" if "$x";
$x = $image->Scale(width=>$newW, height=>$newH);
warn "$x" if "$x";

the image I got was scales to the right size, but the file size is HUGE, turns from 150K to 50MB!

Plus the image's compression is still none.

Thanks.

Scale() introduces new colors so the image is no longer monochrome, a requirement for Group4 compression. Instead, use Sample() which does not introduce new colors.

very helpful! Thanx