ImageMagick HowTo.md

ImageMagick HowTo

Resize and crop image

convert input.jpg -resize 100x100^ \
                  -gravity Center  \
                  -crop 100x100+0+0 +repage  \
        output.jpg

• Imagemagick convert resize then crop

Cycle Hue

for i in $( seq 0 100 ); do
  output_file=$( printf "frame%04d.jpg" ${i} )
  convert input.jpg -modulate 100,100,$i ${output_file}
done

• Hue Cycle .gif files with ffmpeg as percentage of duration

Batch Convert Images Into Another Format

Use mogrify:

mogrify -format png *.svg

Old-school method:

Linux (bash):

for f in $(ls *.png); do convert $f "$(basename -s .png $f).jpg"; done

Windows (cmd):

for /r %%f in (.\*.heic) do (
  echo "fullname: %%f"
  echo "name: %%~nf"
  convert "%%f" "%%~nf.jpg"
)