Comments on: 5 ImageMagick command line examples – part 1

By: Kathy

Kathy — Wed, 27 Jan 2010 22:52:55 +0000

I have an issue with a PDF being optimized. what I'm doing right now is
exec("/usr/bin/convert uploads/$newName.pdf -resize 200×200 uploads/$newName.jpg"); it works for all PDF's that are not optimized. How can I have this work for them too!

By: Anthony Thyssen

Anthony Thyssen — Sat, 10 Jan 2009 04:00:41 +0000

The 'animation' link is wrong, and has been for a long time. Animation in IM examples is now in three sections (there is a lot of info and techniques). I suggest you visit the primary source site for more detail, and techniques about any of these examples http://www.imagemagick.org/Usage/

By: Armin Theissen

Armin Theissen — Sat, 29 Dec 2007 14:41:15 +0000

Hi – I wanted to rotate an image by 90 degrees from the
command line, but 'convert -rotate' will decrease the
image quality a bit. Any alternative?
The reason for the quality loss is probably due to some
real calculations (sines, cosines) in a transform matrix, but
for 90/180/270 deg rotations you would just need to
swap pixels…

By: wikifun

wikifun — Mon, 17 Sep 2007 00:51:17 +0000

hi. Thanks for this. I was looking for something like that. However when I tried some of the scripts linux came back with an error. For example, the first two commands worked. But it did not accept 128×128+50+50 Everytime I wrote a command that had that or anything more than the 50+50 it gave me an error. Any idea what the reason for this is?
Thanks.

By: wander

wander — Sat, 23 Jun 2007 01:51:41 +0000

if I have 2 images of the same size and I need to sum each pixel like this.

image 1 pixel i r=50 g=30 b=100
image 2 pixel i r=150 g=90 b=10

how I can get a result image like this:
image pixel i r=200 g=120 b=110

By: Eric

Eric — Sun, 17 Jun 2007 15:02:23 +0000

If you need to do LOTS of image conversions you need a script. For example, right I have 1705 GIF screenshots (pages of a book) which I want to optimize and convert to JPEG so I can then put it a single DJVU file (like PDF but more efficient). Try converting 1705 files without a script…

By: carson

carson — Wed, 27 Sep 2006 12:32:30 +0000

If you are comfortable putting gimp or photoshop in a script then I would think that would be fine. A lot of people need to be able to script or otherwise call image manipulation programs to do their hard work.

By: dhruv

dhruv — Wed, 27 Sep 2006 10:45:28 +0000

why use the gimp at all in the first place?? we got better options like photoshop and photomagik at our disposal… moreover using linux has proven to be a pain this far

By: Ankit

Ankit — Mon, 25 Sep 2006 11:15:52 +0000

why use the command mode….why not GIMP!!!

By: 5 ImageMagick command line examples part 2 @ IONCANNON

5 ImageMagick command line examples part 2 @ IONCANNON — Sat, 22 Jul 2006 12:44:44 +0000

[...] I've put together another 5 ImageMagick command line examples as a followup to part 1. These examples are a little more advanced and include some extra information on techniques. [...]