If the previous article talked about bulk resizing by percentage, then this article talks about the same resizing but by using resolution values.
Resize to 600x800
for i in *.png; do convert -verbose -resize 600x400 "$i" "`echo $i | sed 's/.png/-converted.png/g'`"; done
Resize to 800x600
for i in *.png; do convert -verbose -resize 800x600 "$i" "`echo $i | sed 's/.png/-converted.png/g'`"; done
Resize to 1024x768
for i in *.png; do convert -verbose -resize 1024x768 "$i" "`echo $i | sed 's/.png/-converted.png/g'`"; done
Resize to 1366x768
for i in *.png; do convert -verbose -resize 1366x768 "$i" "`echo $i | sed 's/.png/-converted.png/g'`"; done
Resize to 1600x1200
for i in *.png; do convert -verbose -resize 1600x1200 "$i" "`echo $i | sed 's/.png/-converted.png/g'`"; done
Sample Results