added scancroppers bash call

README.md

@@ -5,3 +5,5 @@ Collection of notes
 #### rotate all images using imagemagick
 ```mogrify -rotate 180 *.jpg```  
 ```mogrify``` overwrites existing images which is what makes it different from ```convert```
+#### cut poly-shape out of image, crop image to its boundaries, fill surrounding holes in certain color or transparent (for all jpgs in folder)
+```for f in ./*.jpg; do convert "$f" \( -clone 0 -fill black -colorize 100 -fill white -draw "polygon 3276,2421 4945,2407 4956,4708 3287,4722" \) -alpha off -compose copy_opacity -composite -trim +repage 41050648/"$f"_left.jpg; done```