Legacy ImageMagick Discussions Archive

It works on previous sample but not for more complex images.
see:
https://www.dropbox.com/sh/fh2i1vu4604lafm/AAA2w0Gur6OSmHMU7y4iSBkia?dl=0

i use command
convert ^
-size 512x512 xc:white ^
-size 512x512 xc:white ^
-size 512x512 xc:white ^
-combine ^
( img1.png -fill rgb(0,175,235) -opaque ...

Nice, thank you,
last question - how to turn out single layers?
with spot colors its pretty easy - just removing it's line.
but how to turn out single color from base CMYK ?

https://www.dropbox.com/s/ll43uiikkmf34 ... 1.pdf?dl=0
this is source pdf. I can export separations as gray-scales.
now I need to make preview like in acrobat preview based on this grayscales

image set: https://www.dropbox.com/sh/984qvm7z2qrw1v5/AADk4d_FmtGNtJmDlFNwiDxza?dl=0
img_x.png - sources
spotcolors - result I want to achieve when all channels is enabled, or combination of boxes when only part of channels used.

last example, worked more or less fine with basic CMYK boxes ...

I have set of grayscale ( negated?? see command bellow ) images, img_0 .... img_7
where first 4 is CMYK channels, and rest is custom spot colors channels.

I can combine CMYK channels with

convert img_?.png -set colorspace CMYK -negate -combine -colorspace RGB result.png
it requires -negate ...

takes pages 0,1,2 ( 0-2 range ) and 4.
how can I get exactly 25 images 0-24?

tried but it is not helps