App iconDithr

Retro camera filter app for iOS

Sample image
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Color palettes
Download on the App Store

Dithr lets you recall the glory days of 1980s and ’90s computer graphics by snapping photos and videos using common pixel patterns and color palettes of that era.

Modern screens and printers can reproduce millions of colors, making for mostly smooth display of colorful images. But in the early PC days, only a few colors at a time could be rendered, creating the need for color-reduction techniques to get the best results out of limited technology. “Dithering” (also known as “halftoning”) is an umbrella term for various methods of simulating intermediate colors by sprinkling dots of “pure” colors in different patterns.


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Free download gets you a fully functional app for snapping and editing still photos. Add video recording capability for $1.99.

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Dithr implements three of the common algorithms of the 1970s–90s:

Random dithering sample Each pixel randomly chooses the nearest lighter or darker color similar to the original pixel color. This results in a “static” effect which loses a lot of detail on still photos but is pretty cool in video form.
Bayer dithering sample This classic algorithm gives a “cross-stitch” appearance and is very fast to calculate, so it’s great for video.
Floyd-Steinberg dithering sample This more advanced technique creates a much more “organic” look and does a good job at representing smoother color transitions. Since it is much slower than the other filters, Floyd may not work for live video at high resolutions.

Questions? Bugs? Suggestions?

Take a look at our Support page, or shoot us an email at

Share and enjoy!

Dithr is on Twitter, Instagram, Facebook, and Flickr. Post your pics with hashtag #dithr!

Color Palettes

Black & white
Black and white palette The original palette. Not much needs to be said about it!
Eight colors
Eight color palette A simple palette of the six basic “full value” colors—red, green, blue, cyan, magenta, yellow—along with black and white.
Optimized palette This algorithm goes through your image (or live camera frame) and picks out 16 representative colors from the image.
Color Callout
Color callout palette A “special effect” mode that lets you tap any spot in your image and highlight that color, graying out everything else. Great for turning mundane scenes into dramatic artistic statements!
Vintage computer palettes
Vintage computer palettes When personal computers became widespread in the 1970s and ’80s, different brands and models used their own distinctive color palettes. Dithr comes with a few popular historical reenactments to help you trip down memory lane:
  • Apple ][
  • VIC-20
  • Commodore 64

About the Project

Dithr was coded and designed by Chris Lewis.

The font used on this site is Output by David Jonathan Ross. Use good fonts, and pay for them!

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