Cropping 50 images to the same bottom left corner

On Mon, 29 Oct 2018 18:32:47 -0400, Paul wrote

If the composition of the shot is not changing,
then Irfanview itself has a batch processor with
crop capability.

The screen was not changing so I only needed to snap shot a given area.
The quality of the snap shots was not a concern.
The only concern was that it be the same given rectangular bounding box.

I first tried to calculate the given rectangular area with Irfanview
^Options -- Capture Screenshot -- 7) Fixed Screen Rectangle^ but it is
almost impossible to fill out those numbers accurately.
x-pos, y-pos, width, height

They seem simple but if you haven't tried it first you won't realize how
hard it is to get those numbers correct. I guess that is because we never
think about actual pixel numbers on a screen.

What saved the day was that the 50 photos were of the entire screen.
The Irfanview ^File -- Batch Conversion/Rename -- Use advanced options
for bulk resize -- Advanced -- Crop^ section was different.

That crop section has a button called ^Get current selection^ which is
whited out unless you have an image underneath that has a crop selection
area defined.

Even though I was familiar with Irfanview, unless all the conditions are
met that you can't do it on initial screenshot and you can't do it on an
image that doesn't have a crop area already selected, that ^Get current
selection^ doesn't work.

It was only because ^Paul in Houston TX^ said it worked that I kept trying
until I had the right conditions for it to work. Otherwise the calculation
to get the 4 numbers exactly correct is too hard and therefore offputting.