Legacy ImageMagick Discussions Archive

I use a jar http://www.java2s.com/Code/Jar/j/Downlo ... 085jar.htm for resizing images like jpeg,png. This jar gives a good quality of image after resize which I feel better than that of imagemagick's command
Is there any other way of resizing image to produce the same quality of the jar using convert command?

Ganesha wrote:

Code: Select all

convert test.jpg -resize WxH> testresize.jpg

Is there any other way of resizing image to produce the same quality of the jar using convert command?

Maybe try this...

On doing so, what filter it uses?

I think the standard filter is Lanczos; see: http://www.imagemagick.org/script/comma ... php#filter

I wouldn't use JPEG as output to compare resizing from two different systems.

Perhaps you can show us an example input and output where you think the java version is better.

Lots of different resizing techniques depending upon upscale vs downscale and subject matter. See
http://www.imagemagick.org/Usage/filter/
http://www.imagemagick.org/Usage/filter/nicolas/

By default IM jpeg -quality is somewhere between 75 and 85. Try passing 90 or 95 (100 is overkill in most cases). Also to improve look of files with sharp edges don't forget about '-sampling-factor 1x1'.

IM jpeg default quality is to match the input if the input quality is given or if not use 92. See http://www.imagemagick.org/script/comma ... hp#quality