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ImageMagick Cheats

Resize and save to 75 quality all JPGs

mogrify -resize 1296x864 -quality 75 *.jpg
! = Ignore Aspect Ratio
> = Only Shrink Larger
< = Only Enlarge Smaller
^ = Fill Given Area
% = Percentage Resize
@ = Pixel Count Limit

Create thumbnails with letter/pillar boxing

mogrify -resize 80x80 -background white -gravity center -extent 80x80 -format jpg -quality 75 -path thumbs *.jpg

Resize all images to fit inside 640x480px and strip the metadata

mogrify -resize '640x480>' -strip *.jpg

Convert all BMPs to JPG

mogrify -format jpg -quality 90 *.bmp

Create thumbnails without extended spaces

mogrify -resize 640x640 -format jpg -quality 75 -path thumbs *.jpg

Thumbnails 2

mogrify -resize "160^>" -gravity center -crop 160x160+0+0 -format jpg -quality 75  *.jpg
mogrify -resize "200x200^" -gravity center -crop 200x200+0+0 -format png *.psd

Create smaller versions of images only if they are bigger than X dimension and fit inside X dimension:

mogrify -resize "1024x1024^>" -format jpg -quality 75 -path thumbs *.jpg

Crop

mogrify -crop "1920x1080+320-0"  +repage -format jpg -quality 75 *.jpg

Watermark

mogrify \
-gravity SouthEast \
-draw "image Over 0,0 0,0 'copyright.png'" \
-format jpg \
-quality 75 \
-path wm \
*.jpg

Slice image

convert tocut.png -crop 265x265 +repage +adjoin %d.png

Remove padding

mogrify -trim +repage *.png

Add padding

mogrify -background none -gravity center -extent 162x162 *.png

Create thumbnails

mogrify -format png -resize 128x128 -path 128 folder/*.png
mogrify -format png -resize 40x40 -path 40 folder/*.png

Change DPI

mogrify -resample 150 *.tiff

To grayscale

mogrify -set colorspace Gray -separate -average *.tiff

JPG Grayscale

mogrify -format jpg -quality 90 -set colorspace Gray -separate -average *.tiff

PDF to PNG

convert -density 150 file.pdf file.png

Create PDF from BMP

# Pad and crop
mogrify -background white -gravity NorthWest -extent 2550x3300 -crop 2550x3300+0+0 *.bmp

# To JPG
mogrify -format jpg -quality 75 *.bmp

# To PDF
mogrify -format pdf *.jpg

# Consolidate PDF (OLD)
pdftk *.pdf cat output ../Doc2.pdf

# Before Monterey
"/System/Library/Automator/Combine PDF Pages.action/Contents/Resources/join.py" -o all.pdf *.pdf

# After Monterey

# poppler pdfunite
brew install poppler
pdfunite fileA.pdf fileB.pdf output.pdf
pdfunite *.pdf output.pdf

# Ghostscript
gs \
-dNOPAUSE \
-sDEVICE=pdfwrite \
-sOUTPUTFILE=merged.pdf \
-dBATCH \
*.pdf

# Reduce PDF Size with Ghostscript
gs \
-sDEVICE=pdfwrite \
-dCompatibilityLevel=1.4 \
-dPDFSETTINGS=/prepress \
-dNOPAUSE \
-dQUIET \
-dBATCH \
-sOutputFile=compressed_PDF_file.pdf \
input_PDF_file.pdf


# PDF to PNG
ls --color=never test*.pdf | sed 's|.pdf||' | xargs -I{} pdftoppm {}.pdf -png {}

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