Imagemagick Usage Guide & Examples

# Resize Images In This Folder - Simple function to resize images .
# Resource : http://www.imagemagick.org/script/command-line-processing.php#geometry
# Resource : https://unix.stackexchange.com/questions/129391/passing-named-arguments-to-shell-scripts

function riitf(){

local ImageFindingRegex='\./.+\.(?:jpg|JPG|jpeg|JPEG|png|PNG)$';

local ResizedImageQuality="90%";
local ResizedImageIsCropped=0

while getopts "g:q:c" opt; do
  case $opt in
    g) local ResizedImageGeometryOptions="$OPTARG"
    ;;
    c) local ResizedImageIsCropped=1
    ;;
    q) local ResizedImageQuality="$OPTARG"
    ;;
    \?) echo "Invalid option -$OPTARG" >&2
    ;;
  esac
done
echo

local ResizedImageFolder="_resized/${ResizedImageGeometryOptions}";

if [ -v "$ResizedImageGeometryOptions"]
then
local ResizedImageGeometryOptions=2000x;
fi

echo "- Starting 'Resize Images In This Folder'";
echo -e "|- Resized Image Geometry Options = ${ResizedImageGeometryOptions}";
echo -e "|- Resized Image Quality = ${ResizedImageQuality}";
echo -e "|- Resized Image Is Cropped = ${ResizedImageIsCropped}";
echo -e "|- Resized Image Folder = ${ResizedImageFolder}";
echo "|- Resizing the following images :";


mkdir -p $ResizedImageFolder;


if [ "$ResizedImageIsCropped"==0 ]
then

	find . -maxdepth 1 -type f \
		-regextype 'egrep' -iregex ${ImageFindingRegex} \
		-exec echo " |- {} " \; \
		-exec convert "{}" -resize "${ResizedImageGeometryOptions}" -quality ${ResizedImageQuality} \
			-set filename:f \'%[f]-%[t]-%[w]x%[h].%[e]\' "${ResizedImageFolder}/%[filename:f]" \;
else

	find . -maxdepth 1 -type f \
			-regextype 'egrep' -iregex ${ImageFindingRegex} \
			-exec echo " |- {} " \; \
			-exec convert "{}" -crop "${ResizedImageGeometryOptions}" -quality ${ResizedImageQuality} \
				-set filename:f \'%[f]-%[t]-%[w]x%[h].%[e]\' "${ResizedImageFolder}/%[filename:f]" \;
fi


echo " ... executing 'bash' as a workaround for function variables not resetting after function execution !!!";

bash

}

for f in *.JPG; do
	mkdir -p ./_temp;
    	printf "Resizing $f\n started ...";
 	    convert "$f" -resize 1200x -quality 80% -set filename:f '%[f]-%[t]-%[w]x%[h].%[e]' _temp/'%[filename:f]'
        printf "Resizing $f\n complete.";
done

for f in *.JPG; do

        img_date=$(identify -format "%[EXIF:DateTime]" $f);
        printf "${img_date}";
		image_date_simple=$(date -f "%Y:%m:%d %H:%M:%S" "$img_date" +"%Y-%m-%d");
		printf "${image_date_simple}";
    	printf "Resizing $f\n started ...";
 	    convert "$f" -resize 1200x -quality 80% -set filename:f '${image_date_simple}-%[t]-%[w]x%[h].%[e]' _temp/'%[filename:f]'
        printf "Resizing $f\n complete.";
done


find . -maxdepth 1 -name "*.jpg"  -exec convert -resize 1200x -quality 80%  -set filename:f '%[t]-%[w]x%[h].%[e]' {} temp/'%[filename:f]' \;

mogrify -path . -resize 1920x1920 -format "_resized-1920x1920.jpg" -quality 80 *.jpg
convert "*.jpg" -resize 1200x1200 -set filename:new "%t_w1200" %[filename:new].jpg
mogrify -path ./temp -resize 1920x -set filename:f '%[t]-w%[w]h%[h].%[e]' -format "%[filename:f]" -quality 80 ./*.{jpg,png}


find . -maxdepth 1 -type f -regextype 'egrep' -iregex '\./.+\.(?:jpg|JPG|jpeg|JPEG|png|PNG)$' \
-exec \
printf "Resizing ${}\n started ..." && \
convert "{}" -resize 1200x -quality 80% -set filename:f '%[f]-%[t]-%[w]x%[h].%[e]' _temp/'%[filename:f]' &&
printf "Resizing ${}\n complete." \
\;