imagealphablending

imagealphablending

Set the blending mode for an image

true **imagealphablending** GdImage $image bool $enable

allows for two different

modes of drawing on truecolor images. In blending mode, the alpha channel component of the color supplied to all drawing function, such as determines how much of the underlying color should be allowed to shine through. As a result, gd automatically blends the existing color at that point with the drawing color, and stores the result in the image. The resulting pixel is opaque. In non-blending mode, the drawing color is copied literally with its alpha channel information, replacing the destination pixel. Blending mode is not available when drawing on palette images. imagealphablending``imagesetpixel

enableWhether to enable the blending mode or not. On true color images the default value is true otherwise the default value is false

return.true.always

Voorbeeld: usage example

<?php
// Create image
$im = imagecreatetruecolor(100, 100);

// Set alphablending to on
imagealphablending($im, true);

// Draw a square
imagefilledrectangle($im, 30, 30, 70, 70, imagecolorallocate($im, 255, 0, 0));

// Output
header('Content-Type: image/png');

imagepng($im);
?>