JPEG Encoder

About the project

This is a simple command line tool that converts BMP image files to JPEG image files.

I made this project because I once learned how the JPEG algorithm worked and thought it was really cool and clever all the things it did to drastically reduce the size of an image, while keeping a good quality.

Moreover, it ended up being a great project to learn to code in the Rust programming language, and learning a whole lot of other interesting stuff, such as Huffman Coding, file headers and much more.

Theory behind the code

If you want to learn how the code and the whole compression process works, you can check out this document. It contains everything I learned in this project, with all the best sources I used.

Getting started

Make sure you have the Rust compiler (You can get it here)
Clone this repository:

git clone https://github.com/uriGrif/jpeg-encoder.git

Go inside the project folder and try it out

cd jpeg-encoder
cargo run -- --image <BMP_INPUT_FILE> [OPTIONS]

OPTIONS:
  -i, --image <IMAGE>
          the input image path
  -o, --output <OUTPUT>
          the output image path (optional) [default: ]
  -s, --subsampling-ratio <SUBSAMPLING_RATIO>
          Subsampling ratio in the format `4:2:0`, `4:4:4`, or `4:2:2` [default: 4:2:0]
  -d, --dct-algorithm <DCT_ALGORITHM>
          DCT algorithm to use: either "RealDct" or "BinDct" [default: real-dct] [possible values: real-dct, bin-dct]
  -h, --help
          Print help
  -V, --version
          Print version

You can also build the binary and use it anywhere

cargo build --release