JPG to ASCII

Converts JPG picture into ASCII symbols. The project was build with JavaScript.

How to run

To run this project on your own machine follow these steps:

Clone this repository with git clone https://github.com/zaxoavoki/jpg-to-ascii.git
Install all dependencies with npm install
Run npm run build and npm run start or simply npm run dev

or check it out here.

About project

Mapping image data

I have used jpeg-js library to read image data. The sRGB (stardard Reg Green Blue) color space is defined in terms of the CIE 1931 linear luminance Ylin, which is given by:

Ylin = 0.2126 Rlin + 0.7152 Glin + 0.0722 * Blin

After mapping each pixel to grayscale with this formula (e.g. rgba(255, 255, 255, 0) => 254.998) I have replaced given value with most suitable one in ascii_map.json.

Resizing image

To make an image smaller I have used an algorithm that just removes every second row or column (depends on what we resize - height or width).

To get number of squeeze times I used tricky formula 2^x = width / 170px.

To-do