with identify command I get some info about images and it looks like this
my_image.png PNG 154x78 154x78+0+0 8-bit DirectClass 946B 0.000u 0:00.000
the image size it is 154x78
but I do not know how to put this values in variables
w=154 #But I want this 154 to be somehow parsed...
h=78
Note this script for parsing should work for all kind of images not just for the .png extension
also if possible I want to know what is the 0+0 in this line 154x78+0+0
Thanks
This is a difficult case to write a regex for, since we don't know if the file name will contain spaces or have an extension or not. Easier would be to use the format switch for identify:
identify -format '%w' filename.jpg
3360
identify -format '%h' filename.jpg
1080
In bash, you'd write:
W=`identify -format '%w' filename.jpg`
H=`identify -format '%h' filename.jpg`
The +0+0 is the offset for the image, +0+0 just means start at 0 on the x axis, and 0 on the y axis. You can read more in the imagemagick manual.
Edited by Mark Setchell
The foregoing answer is perfectly good, and I didn't want to add a competing answer, just a clarification, or minor improvement, that is too big for a comment...
As the OP is using bash, he can get both the width and height in one go, without opening the image multiple times, like this:
read w h < <(identify -format "%w %h" filename.jpg)
along with anything else, such as the colorspace and number of unique colours:
read w h c u < <(identify -format "%w %h %[colorspace] %k" filename.jpg)