####Resize all JPEGs in the current folder to a 760px width, preserve aspect ratio
mogrify -resize 760x *.jpg
####Crop the bottom 20% of all images in the current folder
mogrify -gravity north -crop 100x80% +repage *.jpg
####Invert colours
mogrify -negate *.png
####Make grayscale
convert flash-sale.png -colorspace Gray flash-sale.png
###Put image in centre of larger image
convert codecentric.png -resize 600x -size 1280x720 xc:white +swap -gravity center -composite output/codecentric.png