Since the last post on CSS was popular here is another simple CSS trick that I found useful in the past. Let’s say we want to find the difference between these two images: You can do this by simply inverting the colors and then stacking them together at 50% opacity. This can be achieved with a single CSS filter: -webkit-filter: invert(100%) opacity(50%); What you should get back is a gray image ex
Currently / Founder of Signed and Calendearing. Invested in hundreds of startups via Tifo. Previously / Second engineer hired at GitHub, and advised GitLab ahead of their IPO. So about a year ago I realized that a play on Spaceman Spiff — one of Calvin’s alter-egos — would be a great name for a diffing tool. And that’s how spaceman-diff was born. Then I forgot about it for a year. Classic open sou
Perceptual Image Diff Introduction PerceptualDiff is an image comparison utility that makes use of a computational model of the human visual system to compare two images. This software is released under the GNU General Public License. Contributors Hector Yee for initial code and perceptual metric Scott Corley for PNG file reading Tobias Sauerwein for Fedora Linux RPM Jeff Breidenbach for Debian Pa
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