Funcții GD și Image
PHP Manual

imagecolortransparent

(PHP 4, PHP 5)

imagecolortransparentDefine a color as transparent

Descrierea

int imagecolortransparent ( resource $image [, int $color ] )

Sets the transparent color in the given image.

Parametri

image

O resursă - imagine, întoarsă de una din funcțiile de creare a imaginilor, cum ar fi imagecreatetruecolor().

color

A color identifier created with imagecolorallocate().

Valorile întoarse

The identifier of the new (or current, if none is specified) transparent color is returned.

Exemple

Example #1 imagecolortransparent() example

<?php
// Create a 55x30 image
$im imagecreatetruecolor(5530);
$red imagecolorallocate($im25500);
$black imagecolorallocate($im000);

// Make the background transparent
imagecolortransparent($im$black);

// Draw a red rectangle
imagefilledrectangle($im445025$red);

// Save the image
imagepng($im'./imagecolortransparent.png');
imagedestroy($im);
?>

Exemplul de mai sus va afișa ceva similar cu:

Output of example : imagecolortransparent()

Note

Notă:

Transparency is copied only with imagecopymerge() and true color images, not with imagecopy() or pallete images.

Notă:

The transparent color is a property of the image, transparency is not a property of the color. Once you have set a color to be the transparent color, any regions of the image in that color that were drawn previously will be transparent.


Funcții GD și Image
PHP Manual