If I want to optimize an image by solely shrinking the dimensions, ImageMagick has a command to do this.
convert image.png -resize 50% image.png # This will shrink the image by 50% and overwrite itself
Although, I wanted to generate a shorter version of this where I always know I want to replace the image inplace and I don't have to remember the syntax for the
-resize flag, as it is non-standard (Where single letter flags have a single dash and words have two dashes). I wrote a simple zsh function that I put in my
~/.zshrc file to do this:
convert $1 -resize $2 $1
Now that previous command can be shorted to
img-resize image.png 50%