php man page for imagecolortransparent

Query: imagecolortransparent

OS: php

Section: 3

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

IMAGECOLORTRANSPARENT(3)						 1						  IMAGECOLORTRANSPARENT(3)

imagecolortransparent - Define a color as transparent

SYNOPSIS
int imagecolortransparent (resource $image, [int $color])
DESCRIPTION
Sets the transparent color in the given $image.
PARAMETERS
o $ image -An image resource, returned by one of the image creation functions, such as imagecreatetruecolor(3). o $color - A color identifier created with imagecolorallocate(3).
RETURN VALUES
The identifier of the new (or current, if none is specified) transparent color is returned. If $color is not specified, and the image has no transparent color, the returned identifier will be -1.
EXAMPLES
Example #1 imagecolortransparent(3) example <?php // Create a 55x30 image $im = imagecreatetruecolor(55, 30); $red = imagecolorallocate($im, 255, 0, 0); $black = imagecolorallocate($im, 0, 0, 0); // Make the background transparent imagecolortransparent($im, $black); // Draw a red rectangle imagefilledrectangle($im, 4, 4, 50, 25, $red); // Save the image imagepng($im, './imagecolortransparent.png'); imagedestroy($im); ?> The above example will output something similar to:[NOT DISPLAYABLE MEDIA]Output of example : imagecolortransparent()
NOTES
Note Transparency is copied only with imagecopymerge(3) and true color images, not with imagecopy(3) or pallete images. Note 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. PHP Documentation Group IMAGECOLORTRANSPARENT(3)
Related Man Pages
imagechar(3) - php
imagefill(3) - php
imagefilledellipse(3) - php
imageline(3) - php
imagesettile(3) - php
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