I installed a bare bones Arch Linux system today and took a screenshot. With no graphics utilities installed, I needed a way to convert a PNG to a GIF for a Simple Machines forum template thumbnail. I figured I’d use a command line utility to help me and ImageMagick is installed by default on most distributions. A quick read through the ImageMagick manpage and I found the convert command and thought I’d share it with everyone. Use convert in the following fashion: convert [input-options] input-file [output-options] output-file
convert SMFPress.png -channel Alpha -threshold 80% -resize 120x120 thumbnail.gif
This did a quick, same-size conversion with little loss for me to display the thumbnail online. For more information on the options I used and other options that I didn’t use, take a peek at the ImageMagick Online Help Page for convert.
I love convert. Very handy for changing file types, but I’ve gotten a lot of use out of it for batch resize jobs.
It’s funny…when you use KDE and Gnome a lot you forget about many of these command line options that are just VERY powerful and quick. I had totally forgotten about convert and you’re 100% right…it’s handy in batch jobs as well 🙂 Very handy for script writing 😛
A very interesting article that has been added to my library.
http://fosslib.tsakf.net/record/279
Thanks for the add! You might try looking around a bit here under the tips tag ( http://linux-blog.org/tag/tips/ ) and the tips and tricks tag ( http://linux-blog.org/tag/tips-and-tricks/ ). There is plenty of info here specifically for helping out linux users 🙂
Thanks for the sections info!
a very informative article and i really wanted to learn more from you….. well i am aslo in this obviously, and i usually do this on http://www.wegif.com/
Gif Photo Animation
Nice article.. Thanks for sharing this with us 🙂
Nice info, thanks for sharing.
Can it be used to convert other kind of image extension, maybe “.xwd” just say it to “.jpg”?
regards,
PramonoTunggul.com
.-= Pramono´s last blog ..Installing wordpress. =-.
I’ve always used mogrify -format jpg tux.png or mogrify -resize tux.jpg 120×120, also from the
ImageMagick package. This saves an extra step, thanks for pointing out this command.
Its nice, this is Very use full for changing file types, more over I will get a lot of use out of it for batch resize jobs…
Always nice to find help in a 5 year old blog post 🙂 Thank you
Anytime 😉 Thanks for reading!