Legacy ImageMagick Discussions Archive

GiladD wrote:Hi all,

This is my first attempt at scripting IM, so please forgive me if it's a very silly question.
Basically, my task is to take a folder of multiple pairs of images, overlay them and then save under a new name.
So the file names are:
p1_bg.jpg
p1_fg.png
p2_bg.jpg
p2_fg.png
And I want the combined files to be named p1.jpg, p2.jpg, etc.

Overlaying the images is simple enough using the composite command, like so:
composite -gravity center -quality 100 p1_fg.png p1_bg.jpg p1.jpg

What I'm struggling with is converting it into a batch process and naming the output files sequentially. I keep getting a single file with all of the images overlaid one on top of another, instead of multiple ones. I've tried various things, both in the IM syntax and using loops in the batch file itself, but to no avail.
Any help is greatly appreciated...

for i in $(seq 1 12); do 
   echo \
       composite -gravity center -quality 100 p${i}_{fg,bg}.png p${i}.jpg; 
done

• for ...; do ... ; done : this is called a loop. It causes the command(s) following the do to be run for each iteration of the loop.

• seq 1 12 : this results in a list of numbers, from 1 to 12. Change '12' if you want another number.

• echo \ : echo is included as a temporary safeguard. It only prints the command instead of running it. (The \ character is a 'line continuation' sign only inserted for better structure and means: "Pretend I'm not here and the next line is one the same one as I am..."))

• ${i} : expands into the current number from the sequence defined in the for part.

• {fg,bg} : tells the shell to include first 'fg', then 'bg' into the 'p${i}...png' names.

echo \

i was unexpected at this time.

GiladD wrote:Should have mentioned I use Windows. Is there a DOS equivalent to do that?

GiladD wrote:Should have mentioned I use Windows. Is there a DOS equivalent to do that?

for %i in (1,1,12) do  composite  -gravity center  -quality 100  p%i_fg.png  p%i_bg.png  p%i.jpg