Note Submitter: ttoohey at php dot net
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This function is similar to the existing
ImageAlphaBlending() function in that it affects the way
pixel drawing will be done during any kind of drawing
function. It extends the functionality by allowing you to
use one of the effect modes (listed below).
"effect" takes one of the values:
IMG_EFFECT_REPLACE
Use pixel replacement (equivalent of
ImageAlphaBlending(FALSE))
IMG_EFFECT_NORMAL
Use normal pixel blending (equivalent of
ImageAlphaBlending(TRUE))
IMG_EFFECT_OVERLAY
Use the overlay routine. Overlay has the effect that
black background pixels will remain black, white background
pixels will remain white, but grey background pixels will
take the colour of the foreground pixel.
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