📦 javache / GIF87a

Installation

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Chdir to the project directory and run cabal install. The main executable will be placed in your ~cabal/bin folder.

Usage

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You can use this utility to perform simple operations on GIF87a-files. Since GIF-files with this exact format are hard to come by these days, use ImageMagick's convert to convert other images to GIF87a.

convert input.jpg output.gif87

The main application executable, gif87a, takes as its arguments a list of gif87a-files. The output will depend on the given options:

-e --encode Re-encode the images -p --parse Show the internal structure of the image -t --transform Apply transformations to each image

Code

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Source-code can be found in the GIF87a-folder, the main executable in GIF87a.hs. The code is organized as follows

GIF87a.Image: datatype for parsed images GIF87a.Parser: AttoParsec-parser GIF87a.Encoder: image encoder GIF87a.Transformations: some higher order functions and predefined transformations on images GIF87a.LZW implementation of the GIF LZW alorithm

Some tests can be found in the test-folder.