Important notice: the development of WideImage 1.0 branch is discontinued.
Please visit
http://wideimage.sourceforge.net for the new version of library and documentation.
This web site will remain accessible to serve as documentation for the old versions of the library.
For help on migration, please refer
to the
migration
guide.
wiImage::asMask()
See:
List of operations
Signature
wiImage::asMask()
Parameters
- result (wiTrueColorImage): a mask (greyscale true-color image)
Description
This method returns a mask of an image. For transparent images with single-color transparency this is a black and white image with transparent areas marked as black, and non-transparent as white. For alpha-transparent images, strength of grey color (r=g=b) marks the opacity for each pixel, where black is completely transparent and white is completely opaque.
Examples
$img = wiImage::load('/path/to/an/image.png');
$mask = $img->asMask();
CategoryDocApi
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