[Python] Fit multiple png´s optimally on a DinA4 PDF using ImageMagick (or python) on Mac

I have a bunch of png´s in a folder, which I want to print out. Each of them is 640x960 pixels big and should be 6.7x10cm when printed out. I used to put every picture in Word, specify the size and then print them out.

Because I have to do that task repeatedly I want to automate it. I found ImageMagick and installed it on my Mac. However I don't seem to get the dimensions quite right.

I tried:

montage -geometry 1181x792+50+50 -page 2480x3508 -density 300 -adjoin *.png output.pdf


But the pictures don't have the right dimensions if printed out. A nice Bonus would be to find an optimal way to mimize white space on the A4 Page. I can fit one more pic in Word if I rotate it.

A python solution would also be fine if anyone has ideas! thank you!

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