====== Generate Wallpaper ======

<code dos>
@echo off

set ImageMagickDir=C:\Program Files\ImageMagick-6.7.5-Q16
set IMConvert="%ImageMagickDir%\convert.exe"
set IMMogrify="%ImageMagickDir%\mogrify.exe"

set PrimaryImage=1920x1200\00.png
set SecondaryImage=1600x900\00.png
set OutputImage=Wallpaper.jpg

set SecondaryImageSize=1600x1920
rem This value should be 900 - y offset in Display Properties -> Settings, display 2.
set SecondaryImageOffset=+772
rem 128

rem goto skip

rename 1600x900\00.png x.png
rename 1600x900\01.png 00.png
rename 1600x900\02.png 01.png
...
rename 1600x900\46.png 45.png
rename 1600x900\47.png 46.png
rename 1600x900\x.png 47.png

rename 1920x1200\00.png x.png
rename 1920x1200\01.png 00.png
rename 1920x1200\02.png 01.png
...
rename 1920x1200\48.png 47.png
rename 1920x1200\49.png 48.png
rename 1920x1200\x.png 49.png

:skip

rem Convert "(" %PrimaryImage% ")" "(" "(" %SecondaryImage% -rotate -90 ")" "(" %SecondaryImage% -rotate -90 ")" -append -crop %SecondaryImageSize%+0%SecondaryImageOffset% +repage ")" +append %OutputImage%

Convert "(" %PrimaryImage% +repage ")" "(" "(" %SecondaryImage% +repage ")" "(" %SecondaryImage% +repage ")" -append -crop %SecondaryImageSize%+0%SecondaryImageOffset% +repage ")" +append %OutputImage%
pause
</code>