Please, I don't understand anything about commands and stuff, so go easy about the technical stuff. I'm using Windows 10. Something like this:
[Before]

[Later]

Code: Select all
magick image1 image2 -resize "x%[fx:max(u.h, v.h)]" +append result
Code: Select all
ht=`convert image1 image2 -format "%[fx:max(u.h, v.h)]\n" info: | head -n 1`
convert lena.png monet2.jpg -resize "x$ht" +append result
Good catch. I completely missed that.