imagelayereffect
Set the alpha blending flag to use layering effects.
Parameters
- image
A GdImage object, returned by one of the image creation functions, such as imagecreatetruecolor.
- effect
-
One of the following constants:
- IMG_EFFECT_REPLACE
-
Use pixel replacement (equivalent of passing true to imagealphablending)
- IMG_EFFECT_ALPHABLEND
-
Use normal pixel blending (equivalent of passing false to imagealphablending)
- IMG_EFFECT_NORMAL
-
Same as IMG_EFFECT_ALPHABLEND.
- IMG_EFFECT_OVERLAY
-
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.
- IMG_EFFECT_MULTIPLY
-
Overlays with a multiply effect.
Return Values
Returns true on success or false on failure.
Changelog
| Version | Description |
| 8.0.0 | image expects a GdImage instance now; previously, a resource was expected. |
| 7.2.0 | Added IMG_EFFECT_MULTIPLY (requires system libgd >= 2.1.1 or the bundled libgd). |