Probably solved, see below
Request for #followerpower
How do I get #imagemagick to create an output as 1bit image (PNG or BMP)?
I tried "-depth 1" and "-monochrom" and similar things, but it always creares an image with 3*8bit depth.
My current command line is:
magick -background white -fill black -font Arial -size 800x400 -pointsize 96 -depth 1 -monochrome "label:This is a test" test.bmp
Update:
Order matters. If the "label" is behind "-depth 1" it ruins it. Thanks for all replies.
magick -background white -size 800x400 -fill black -font Arial "label:Das ist ein Test" -depth 1 -monochrome demo.bmp ; magick identify demo.bmp
demo.bmp BMP 800x400 800x400+0+0 1-bit sRGB 2c 40130B 0.000u 0:00.000
Update 2:
It is still not displaying an image, but I think I am getting there. I only have one try per refresh every 15min.
Update 3:
Sometimes it pays of to check the documentation more carefully: https://docs.usetrmnl.com/go/imagemagick-guide
In 10min I will see if it works. Looks like "-strip" is also important.