Double the resolution in print_image.sh

print_image.sh

@@ -2,7 +2,7 @@
 set -e
 dev=/dev/usb/lp0
 
-image="$(magick "$1" -resize 256x -dither FloydSteinberg -remap pattern:gray50 pbm:- | base64)"
+image="$(magick "$1" -resize 512x -dither FloydSteinberg -remap pattern:gray50 pbm:- | base64)"
 data_header="$(echo "$image" | base64 -d | sed -n '2p')"
 data="$(echo "$image" | base64 -d | tail -n +3 | base64)"
 
@@ -18,15 +18,15 @@ size_y="$(hex_size "$(echo "$data_header" | cut -d' ' -f 2)")"
 # Upload graphics data
 printf '\x1D(L' > $dev
 printf "$size" > $dev
-printf '\x30\x70\x30' > $dev
-printf '\x02\x02' > $dev  # bx, by (1 or 2)
-printf '\x31' > $dev  # color
+printf '0p0' > $dev
+printf '\1\1' > $dev  # bx, by (1 or 2)
+printf '1' > $dev  # color
 printf "$size_x" > $dev  # size x
 printf "$size_y" > $dev  # size y
 echo "$data" | base64 -d > $dev
 
 # Print graphics data
-printf '\x1D(L\x02\0\x30\x02' > $dev
+printf '\x1D(L\2\00002' > $dev
 
 # Cut paper
-printf '\n\n\x1DVA\0' > $dev
+printf '\n\n\n\x1DVA\0' > $dev