friday-devil alternatives and similar packages
Based on the "friday" category.
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friday-scale-dct
Uses discrete cosine transform to rescale images from the Haskell Friday image library.
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README
Provides bindings to the DevIL image library to load and save friday images.
DevIL is a fast image library written in C. The library must be installed on the host system before usage.
Supports a wide variety of image formats, including BMP, JPG, PNG, GIF, ICO and PSD.
Quick tour
Storage images
Images returned from load or passed to save must be Convertile from and to
StorageImages. The StorageImage type is defined as:
data StorageImage = GreyStorage Grey | RGBAStorage RGBA | RGBStorage RGB
The following example reads an image from a file, automatically determining
the image format, and then writes it back into a ByteString as a greyscale
PNG image.
{-# LANGUAGE ScopedTypeVariables #-}
main = do
io <- load Autodetect "image.jpg"
case io of
Right (rgb :: RGB) -> -- Forces the RGB colorspace for the loaded image.
let grey = convert rgb :: Grey
bs = saveBS PNG grey
in print bs
Left err -> do
putStrLn "Unable to load the image:"
print err
See the friday-examples package for a set of examples.