imagecolorexactalpha
(PHP 4 >= 4.0.6, PHP 5)
imagecolorexactalpha — Get the index of the specified color + alpha
說明
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.
參數
- 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值
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.
註釋
Note: 本函式需要 GD 2.0.1 或更高版本（推薦 2.0.28 及更高版本）。