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Within LTS Haskell 24.40 (ghc-9.10.3)

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1. colorMap :: Pixel a => (PixelBaseComponent a -> PixelBaseComponent a) -> a -> a

   JuicyPixels	Codec.Picture.Types

   Apply a function to each component of a pixel. If the color type possess an alpha (transparency channel), it is treated like the other color components.

2. dynamicMap :: (forall pixel . Pixel pixel => Image pixel -> a) -> DynamicImage -> a

   JuicyPixels	Codec.Picture.Types

   Helper function to help extract information from dynamic image. To get the width of a dynamic image, you can use the following snippet:

   dynWidth :: DynamicImage -> Int
   dynWidth img = dynamicMap imageWidth img
   

3. dynamicPixelMap :: (forall pixel . Pixel pixel => Image pixel -> Image pixel) -> DynamicImage -> DynamicImage

   JuicyPixels	Codec.Picture.Types

   Equivalent of the pixelMap function for the dynamic images. You can perform pixel colorspace independant operations with this function. For instance, if you want to extract a square crop of any image, without caring about colorspace, you can use the following snippet.

   dynSquare :: DynamicImage -> DynamicImage
   dynSquare = dynamicPixelMap squareImage
   
   squareImage :: Pixel a => Image a -> Image a
   squareImage img = generateImage (\x y -> pixelAt img x y) edge edge
   where edge = min (imageWidth img) (imageHeight img)
   

4. extractLumaPlane :: LumaPlaneExtractable a => Image a -> Image (PixelBaseComponent a)

   JuicyPixels	Codec.Picture.Types

   Extract a luma plane out of an image. This method is in the typeclass to help performant implementation.

   jpegToGrayScale :: FilePath -> FilePath -> IO ()
   jpegToGrayScale source dest
   

5. pixelFoldMap :: forall m px . (Pixel px, Monoid m) => (px -> m) -> Image px -> m

   JuicyPixels	Codec.Picture.Types

   Fold over the pixel of an image with a raster scan order: from top to bottom, left to right. This functions is analog to the foldMap from the Foldable typeclass, but due to the Pixel constraint, Image cannot be made an instance of it.

6. pixelMap :: (Pixel a, Pixel b) => (a -> b) -> Image a -> Image b

   JuicyPixels	Codec.Picture.Types

   map equivalent for an image, working at the pixel level. Little example : a brightness function for an rgb image

   brightnessRGB8 :: Int -> Image PixelRGB8 -> Image PixelRGB8
   brightnessRGB8 add = pixelMap brightFunction
   where up v = fromIntegral (fromIntegral v + add)
   brightFunction (PixelRGB8 r g b) =
   PixelRGB8 (up r) (up g) (up b)
   

7. pixelMapXY :: (Pixel a, Pixel b) => (Int -> Int -> a -> b) -> Image a -> Image b

   JuicyPixels	Codec.Picture.Types

   Just like pixelMap only the function takes the pixel coordinates as additional parameters.

8. toneMapping :: PixelF -> Image PixelRGBF -> Image PixelRGBF

   JuicyPixels	Codec.Picture.Types

   Perform a tone mapping operation on an High dynamic range image.

9. foldl1Map :: forall (f :: Type -> Type) b a . Foldable f => (b -> b -> b) -> (a -> b) -> T f a -> b

   non-empty	Data.NonEmpty

   It holds:

   foldl1Map f g = foldl1 f . fmap g
   

   but foldl1Map does not need a Functor instance.

10. parMap :: Strategy b -> (a -> b) -> [a] -> [b]

    parallel	Control.Parallel.Strategies

    A combination of parList and map, encapsulating a common pattern:

    parMap strat f = withStrategy (parList strat) . map f
    

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