Legacy ImageMagick Discussions Archive

I have this montage
1 2 3
4 5 6
7 8 9
And i want if 8 image not exist to be replaced by a white space. Right now 9 is moved in that place and 9's position is white.
How to do that?
My command is: montage -quality 100 -tile 3x3 -geometry 457x284-0-0 + list of images paths.

I tried with -immutable option but i dont know how to use it. montage -quality 100 -tile 3x3 -geometry 457x284-0-0 -immutable + list of images paths.

Thanks!

Test if an image exists via unix commands and if it does not then replace the image with null: in your list of images

See Montage in IM Examples
Leaving Gaps in a Montage
http://www.imagemagick.org/Usage/montage/#null