fabiolmorato / cpgm

Plain PGM image compressor

cpgm

cpgm is a Plain PGM image compressor. Although it compresses an image of resolution NxM to a N+M file, it is not a good solution for large images in which colors vary a lot.

How does it work?

cpgm does not use fancy compression algorithms. It approximates the elements of a NxM matrix as the product of the average of it's line and column.

How can I use it?

First, compile it by running

make compress
make uncompress

Then, to compress a image, run ./compress <input_image.pgm> <output_image.cpgm>. To uncompress it run ./uncompress <compressed_image.pgm> <output_file.pgm>.

Why did you make this?

I wanted to visualize how good of an approximation was this approach.