Re: reducing ringing on text

>What I was wondering is whether there is any good way to prefilter
>images of text that will  help prevent  the ringing caused by using the
>generic prefilter used by the 'resize' operation.


With pdf files you can do supersampling using the density

convert -density 288 image.pdf -resize 25% image.png

but this only works with vector input images to my knowledge.

using 600x600 does not force the result to 600x600, but scales the 
largest dimension to 600 and the smaller is kept at the same aspect 
ratio. see 600x600! to resample to exactly 600x600. also see 600x600^ 
to resize to the smaller dimension and have the larger keep aspect 
ratio.  see 
http://www.imagemagick.org/script/command-line-processing.php#geometry

you can use various filters with -resize

-filter xxx -resize 600x600

see
http://www.imagemagick.org/Usage/resize/#artifacts
http://www.imagemagick.org/Usage/resize/#filter

Sorry, perhaps you can post links to an example of your input and output image

Are you using the latest IM?


Fred