crabwood5.tif
This can be found on the internet and when overlapped with Crops.jpg you can see a difference in the dots.
I am finding the original colored image file from the puzzle here:
http://kodczasu.pl/viewtopic.php?p=8866Not sure if the overlay approach makes sense.
of course it makes sense. That way i was able to quickly see what was changed. Certainly it is only the change dots that are relevant. The decoded version is somewhere above.