lennart said:
The ratio of my banner is 4:1, and the source pictures are 6mp-jpgs [...]
So yes, indeed i want to crop it and then resize it.
I've spend some hours and I've come up with a possible solution.
Since I'm the author of JPEGCrops, I've naturally tweaked that program
to do what you want, instead of finding a (possibly better) solution.
This will only make it easy for you, if you have a large number of
images to process, as it takes some time to set up.
If you want to try, do the following:
1) Download and install ImageMagick:
http://www.imagemagick.org .
2) Add the ImageMagick install directory to your path.
3) Download and install JPEGCrops 0.7.0b from
http://ekot.dk/JPEGCrops/
4) Go to Preferences and turn on Advanced settings in JPEGCrops.
5) Click Add... and specify your aspect. You seem to need the "Fixed
aspect ratio without units"-kind with the values 4 and 1.
6) Enable "After crop" and write something along the lines of
convert %D -geometry 700x400 -quality 75 %D
in the field next to it.
7) Press OK and select your new aspect in the "Default Aspect"-list.
8) Press OK, open an image, select an area and crop it.
The resulting image should have the correct proportions and be at the
correct size. ImageMagick uses Lanczos for resizing, when nothing else
is specified, so the quality should be high.