Is it possible to crop and resize in one step in GIMP

If you open up gimp, you can do one of two things to get your image. The first is to just use the autocrop image tool. This will crop to the box around the circle.

You can also select all the transparent area with the magic wand tool, and then go to Select->invert selection. Now you are selecting your image, and can cut/copy/paste/crop to selection.

I actually do something similar every month for my lunch expenses, with receipts of various formats.

• I take pictures of all the receipts using a fixed camera, so the receipts have a varying size inside the frame

• I mass-process the images in Gimp:

  • Crop tool to crop the image to the receipt (one mouse drag, one double-click). For your specific purpose you can set the crop tool to have a fixed ratio.
  • Save picture and load next in sequence (this is a single keystroke, once you ave installed the ofn-file-next script and set up a shortcut)

  This takes a few seconds per image, so you process a hundred images in 5 minutes.

• Once I have the cropped images on disk, I use ImageMagick in a shell script to set them all to the same size:

#! /bin/bash

dir=${1:-.}

for f in "$dir/"*.JPG; 
do
        echo "Processing $f"
        convert "$f" -resize 600x -sharpen 0x1.0 -quality 85 "$dir/$(basename "$f" .JPG).jpg"
done

Warning: the script above assumes that the input images are JPG, and that the filesystem is case-sensitive

ImageMagick is also available for Windows (but of course you have to adapt the script above for BAT or Powershell).