Subpixel

Replace each horizontal pixal in an image with an RGB sub-pixel. Reduces the width of an image to one third of its original width. Converts an image to grayscale before scaling.

Aspect ratio can be maintained using the -a flag, but it reduces the images height to 1/3 its original height when converting to subpixel to match the new width, and stretches the image's height 3x when converting back to full size grayscale or expanded pixel format.

Why?

I thought it would be interesting.

Inspired by https://www.youtube.com/watch?v=SlS3FOmKUbE

Usage

Usage of subpixel:
  -a    maintain aspect ratio when converting, makes the image 1/3 as tall when shrinking and 3x taller when reversing
  -e    expand each pixel to three full color pixels
  -i string
        input png
  -o string
        output png
  -r    reverse process

Building

go build

Example

Reduce width to subpixel rendering

subpixel -i smiley.png -o smiley-subpixel.png

->

Convert back to full width from subpixel rendering, grayscale

subpixel -r -i smiley-subpixel.png -o smiley-restored.png

->

Expand subpixel image to full width, maintaining subpixel colors

subpixel -e -i smiley-subpixel.png -o smiley-expanded.png

->