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, PHP 7, PHP 8)
imagecolorexactalpha — Retorna o índice da cor especificada + transparencia
Descrição
imagecolorexactalpha
( resource
$image
, int $red
, int $green
, int $blue
, int $alpha
) : intRetorna o índice da cor especificada + transparencia na paleta da imagem especificada.
Se a cor não existir na paleta de imagem, é retornado -1.
Veja também imagecolorclosestalpha().
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User Contributed Notes 2 notes
matt at matt-darby dot com ¶
18 years ago
phpdoc-comment at aditus dot nu ¶
21 years ago
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.
