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Implements greyscale thresholding

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David Carley
2015-11-17 12:15:34 -06:00
parent 5dfeaa9fd1
commit 3af62446fc
14 changed files with 189 additions and 4 deletions
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docs/api.md
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@@ -328,6 +328,12 @@ When a `radius` is provided, performs a slower, more accurate sharpen of the L c
* `flat`, if present, is a Number representing the level of sharpening to apply to "flat" areas, defaulting to a value of 1.0.
* `jagged`, if present, is a Number representing the level of sharpening to apply to "jagged" areas, defaulting to a value of 2.0.
#### threshold([threshold])
Converts all pixels in the image to greyscale white or black. Any pixel greather-than-or-equal-to the threshold (0..255) will be white. All others will be black.
* `threshold`, if present, is a Number, representing the level above which pixels will be forced to white.
#### gamma([gamma])
Apply a gamma correction by reducing the encoding (darken) pre-resize at a factor of `1/gamma` then increasing the encoding (brighten) post-resize at a factor of `gamma`.