I'm trying to write a script to create a thumbnail for a picture and I have a problem.

I've been searching for hours, but I just can't figure out why I always get the error "Procedure execution of file-jpeg-save failed on invalid input arguments".

I use a similar script for cropping dvd covers and I have no problems saving with it, but for some reason, it won't work here.

I tried to manually enter every parameters I could to eliminate a bad variable, but it changed nothing. I even tried the picture I'm using to test it with my other script and it works perfectly so the problem is not the source.

Here's the script(the only parameter is the filename without the .jpg) and I hope someone can figure out what the problem is:

The 'q' parameter should be a value between 0.0 and 1.0 (e.g., 0.85).

Thank you so much. I knew it had to be something stupid and I guess I'm too used to give a full integer as quality in the gui.

Everything works fine now, thanks again.

Just wondering why you don't use ImageMagick for this? For instance, creating a thumb-$n
file for every JPG in the current directory, with a small side of 200 pixels:

convert *.jpg -geometry 200x200^ -set filename:out "thumb-%f" '%[filename:out]'

Because I like to install as little software as possible and gimp can do the job exactly as I want it to. Like choosing the quality which your example doesn't seem to do. Also, it was important that only the height be fixed, not the width(not sure if your example do this or not, I don't understand it fully).

Also, I like to familiarize myself with script-fu since I find it can be very useful and since I tend to forget things, the more I make scripts the better.

ImageMagick has a full range of options, this was only an example. It's one of the best bang for the buck^H^H^H^Hdisk-space around... Not speaking of execution speed.

I'm like you, I find that script are the best way to document things, but they don't have to be script-fu

Maybe I'll try it out if I have free time. For now, gimp is just less trouble since I'm more familiar with it, it's already installed on my many computers and I'm entirely satisfied with it for the little times I use it.