SIPS - Easy Image Conversion

SIPS
Add Icon(Mostly Useless)
sips -i /PATH/TO/IMAGE

Resize to Largest Plane - Very Useful - Supports Wildcards:
sips -Z 100 /PATH/TO/IMAGE sips -Z 250 /PATH/TO/FOLDER/*

Convert PDF to JPG
sips -s format jpeg /PATH/TO/PDF --out /PATH/TO/IMAGE

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Other Command-Line Conversion Options

Imagemagick
Convert - convert image A to image B /ImageMagick-6.0.0/bin/convert /PATH/TO/ORIGINALIMAGE /PATH/TO/OUTPUTIMAGE

Mogrify
Alter existing images in place
To resize a folder full of .jpgs, use the following examples (adjust -sample and -quality values to your liking): /ImageMagick-6.0.0/bin/mogrify -sample 300x300 -quality 100 +profile "*" *.jpg /ImageMagick-6.0.0/bin/mogrify -sample 125x125 -quality 50 +profile "*" *.jpg