T o n g <[EMAIL PROTECTED]> writes: > Hi, > > What's the proper way to downsize an image? > > I want to downsize my 1152x864 image to 500x, so I did: > > convert -resize 500x screenshot.png screenshot-thumbnail.png > > I was thinking that the downsized thumbnail should be around 1/4 of the > original size, but I am totally wrong: > > $ identify screenshot* > screenshot-thumbnail.png PNG 500x375 500x375+0+0 DirectClass 509kb > screenshot.png[1] PNG 1152x864 1152x864+0+0 DirectClass 82kb > > $ ls -l screenshot* > -rw-r--r-- 1 tong tong 521280 03-29 16:54 screenshot-thumbnail.png > -rw-r--r-- 1 tong tong 83876 2007-01-01 screenshot.png > > The size is not smaller but over 6 times bigger. > > I remember that I need to something extra, so I tried the following, but > that didn't help. The thumbnail is the same size as before: > > convert -size 500x375 -resize 500x screenshot.png screenshot-thumbnail.png > > Please help. > > Thanks
You are probably using an imagemagick compiled with quantum depth 16, so images you produce have 16 bits per channel. `-depth 8' will produce 8 bit images, reducing file size. The arg order in your convert commands is also wrong.. see http://imagemagick.org/Usage/basics/ John Foerch _______________________________________________ Magick-users mailing list [email protected] http://studio.imagemagick.org/mailman/listinfo/magick-users
