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Added example of custom pixels function

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Devine Lu Linvega 2019-08-04 18:13:03 +09:00
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WORKSHOP.md
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@ -155,6 +155,18 @@ First let's open an image, ideally one in color, and change every pixel of a sel
(rect 100 100 200 200)) (rect 100 100 200 200))
``` ```
The `(pixels)` function expects a function that returns 4 values(r,g,b,a), and so you can define a custom filter like:
```
(defn invert
(pixel)
(
(sub 255 pixel:0)
(sub 255 pixel:1)
(sub 255 pixel:2) pixel:3))
(pixels invert)
```
### saturation ### saturation
In the previous example, we increased the saturation of a region of the image, to desaturate an entire image, you can simply omit the `(rect)` which will select the entire canvas, and set the pixel filter to `saturation` and the value to `0.5`(50% saturation): In the previous example, we increased the saturation of a region of the image, to desaturate an entire image, you can simply omit the `(rect)` which will select the entire canvas, and set the pixel filter to `saturation` and the value to `0.5`(50% saturation):