resizing pictures with ImageMagick
 

hey everyone,
I found this app for resizing images. for some reason my camera took pictures in huge sizes (3000+ pixels) and I need to resize them to a normal size. so, I found this prog which does a great job with the 'convert' command.

i'm trying to make it convert all the pictures in one command.
its syntax is: convert -resize size pic.jpg newpic.jpg

I tried by this: ls > convert -resize 800 ..
but i've no idea how to specify its output. any ideas?

Congratulations on discovering one of the major power tools!!

First, your camera has settings to control the output file size. Personally, I alway set it on the highest quality (largest file) and then downsize later.

From your command, it appears you are trying to do batch resizing. Try it your way, and I think it will simply assign its own filenames in some undesirable way. Much better to loop thru the folder---something like this:

<<untested>>

A google search at www.google.com/linux (for Linux related searchs) turns up quite a bit about resizing with Imagemagick. Just search for: imagemagick howto resize

Thanks.. I think its working now. by saying batch you mean write a shell script right?
and can you please explain a lil bit how this small script works?
how does the var $pic gets its value?

thanks again, much appericiated.
saved me tons of time now editing them one by one :)

The for loop assigns as value to the stated variable each time thru the loop.

General syntax:
for <variablename> in <expression>; do
<stuff to do>
done

<expression> can be as simple as the "*" (in this context meaning "everything I can see") or it can be the result of a command

Suppose you wanted only the files with names starting with "G". The loop would start with:

for <variablename> in $(ls|grep "^G")


For more on BASH scripting, head over to http://tldp.org and get the Bash Guide for Beginners

thanks alot pixellany for the explanation.

Got something here:
http://polishlinux.org/apps/graphics...h-imagemagick/