Let's Skip Preview and Just Use ImageMagick
Same problem, one tool… (this would be a great time to set up an S3 media bucket to show results). In addition to ImageMagick, I installed ghostscript with brew install ghostscript to enable working with eps vector images. Starting with a square profile photo: identify nhoag-bw-sq.jpg /path/to/nhoag-bw-sq.jpg JPEG 480x480 480x480+0+0 8-bit sRGB 65.5KB 0.000u 0:00.000 Generate a black rectangle to match the width of the profile photo: convert -size 480x100 xc:black black....