imagecolorexact
Note that a color allocated with imagecolorexactalpha won't show alpha (it will be opaque) when used with imageline(). Use imagerectangle() set to your normal start and end points instead.
Ensure that the image is created via imagecreatetruecolor() as well!
imagecolorexactalpha
(PHP 4 >= 4.0.6, PHP 5)
imagecolorexactalpha — Get the index of the specified color + alpha
Description
int imagecolorexactalpha
( resource $image
, int $red
, int $green
, int $blue
, int $alpha
)
Returns the index of the specified color+alpha in the palette of the image.
Parameters
- image
-
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
- red
-
Value of red component
- green
-
Value of green component
- blue
-
Value of blue component
- alpha
-
A value between 0 and 127. 0 indicates completely opaque while 127 indicates completely transparent.
Return Values
Returns the index of the specified color+alpha in the palette of the image, or -1 if the color does not exist in the image's palette.
Notes
Note: This function requires GD 2.0.1 or later (2.0.28 or later is recommended).
add a note
User Contributed Notesimagecolorexactalpha
matt at matt-darby dot com
12-Jul-2005 02:09
12-Jul-2005 02:09
phpdoc-comment at aditus dot nu
08-Nov-2002 06:01
08-Nov-2002 06:01
What might be misleading in the docs is that if the specified color + alpha channel does not exist it will be created. So if you like to use an alpha channel in your image enable alpha blending and then create you color using this method.