I did some combine images into a single large image code using GTK, Cairo and Pixbuf: https://github.com/bneijt/commitbook/blob/master/src/Rendering.hs I would consider Cairo[1] another. Greetings, Bram [1] http://cairographics.org/ On Wed, Jun 3, 2015 at 9:29 AM, Alexey Vagarenko wrote:

Hello,

There is also https://hackage.haskell.org/package/JuicyPixels

среда, 3 июня 2015 г., 13:19:23 UTC+6 пользователь Geraldus написал:

...

Hi cafe!

I want to do some trivial masking manipulation on PNG images: take a picture, crop it to square shape and then make a circular mask, i.e. take all pixels that lies outside circle with radius equal to half of image width and placed at image center and replace that pixels with zero opacity once (hope this description is clear enough).

I've found two packages for image processing so far: `friday` [1] and `unm-hip` [2], but can't figure out which of them suits my needs, maybe there are some other packages I miss?

[1] https://hackage.haskell.org/package/friday [2] https://hackage.haskell.org/package/unm-hip

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Thank you everybody! *JuicyPixels* was the first package I have thought about, but I've mistaken about its functionality and didn't mentioned it here. *Sylvain*, thank you a lot! You've made my day! ср, 3 июня 2015 г. в 14:52, Sylvain Henry :

Hi,

Here is a solution using JuicyPixels:

import Codec.Picture import Codec.Picture.Types

main :: IO () main = do Right img <- readImage "test.png" _ <- writeDynamicPng "test2.png" (dynamicPixelMap circleImage img) return ()

circleImage :: Pixel a => Image a -> Image a circleImage img = generateImage (\x y -> f x y $ pixelAt img x y) edge edge where edge = min (imageWidth img) (imageHeight img) f x y a = if x'*x' + y'*y' < e'*e' then a else colorMap (const 0) a where e' = edge `div` 2 x' = x - e' y' = y - e'

Sylvain

2015-06-03 9:19 GMT+02:00 Geraldus :

...

Hi cafe!

I want to do some trivial masking manipulation on PNG images: take a picture, crop it to square shape and then make a circular mask, i.e. take all pixels that lies outside circle with radius equal to half of image width and placed at image center and replace that pixels with zero opacity once (hope this description is clear enough).

I've found two packages for image processing so far: `friday` [1] and `unm-hip` [2], but can't figure out which of them suits my needs, maybe there are some other packages I miss?

[1] https://hackage.haskell.org/package/friday [2] https://hackage.haskell.org/package/unm-hip

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