Data.Picture

Documentation

type Picture = (Matrix Double, Matrix Double, Matrix Double, Matrix Double)

(R, G, B, A) color channels

Manipulation functions

grayscale :: Picture -> Picture

Turn the Picture grayscale

fade :: Double -> Picture -> Picture

Fade the Picture by a number between 0 and 1

rotate :: Double -> Maybe (Int, Int) -> Picture -> Picture

Rotate Picture for the specified degrees, around the specified origin. If the origin is Nothing, rotates around the center

contrast :: Double -> Picture -> Picture

Set contrast level of Picture, a number between -255 and 255

brightness :: Double -> Picture -> Picture

Set brightness level of Picture, a number between -255 and 255

gamma :: Int -> Picture -> Picture

Set gamma level of Picture

invert :: Picture -> Picture

Inverts the Picture

compress :: Int -> Picture -> Picture

Compress the image using SVD note: this is not size compression, it's just a k-rank approximation of the image

embed :: Picture -> (Int, Int) -> Picture -> Picture

Embed a Picture into another one, in the specified position-}

resize :: (Int, Int) -> Picture -> Picture

Resize an image using nearest-neighbor interpolation

scale :: Double -> Picture -> Picture

Scale an image using the resize function

Converting between Image and Picture

fromImage :: Image PixelRGBA8 -> Picture

Converts a JuicyPixel 'Image PixelRGBA8' to Picture

toImage :: Picture -> Image PixelRGBA8

Converts a Picture to JuicyPixel 'Image PixelRGBA8'

IO operations

readPicture :: FilePath -> IO (Either String Picture)

Reads a Picture from specified path

writePicturePng :: FilePath -> Picture -> IO ()

Write the specified Picture to a PNG file