Avoiding tilt in imagemagic montage

Question

I use this command to generate montage:

montage *.jpg -thumbnail 600x600 -set caption %t -background grey40 -pointsize 16 -density 188x188 +polaroid -resize 50% -background white -geometry +1+1 -tile 4x4 -title "My Collection" polaroid_t.jpg

The images in the montage get tilted to either left or side. How can I have them strait?

Answer 1

From the fine manual:

Use +polaroid to rotate the image at a random angle between -15 and +15 degrees.

I think you want -polaroid 0 instead of +polaroid.