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View Full Version : Transparent PNG 24bit How?



kaisellgren
07-18-2007, 03:20 PM
Hi,

I have tried PHP manual scripts without luck.

My latest try:


<?php

$size = 300;
$image=imagecreatetruecolor($size, $size);

// something to get a white background with black border
$back = imagecolorallocatealpha($image, 200, 200, 200);
$border = imagecolorallocate($image, 0, 0, 0);
imagefilledrectangle($image, 0, 0, $size - 1, $size - 1, $back);
imagerectangle($image, 0, 0, $size - 1, $size - 1, $border);

$yellow_x = 100;
$yellow_y = 75;
$red_x = 120;
$red_y = 165;
$blue_x = 187;
$blue_y = 125;
$radius = 150;

// allocate colors with alpha values
$yellow = imagecolorallocatealpha($image, 255, 255, 0, 75);
$red = imagecolorallocatealpha($image, 255, 0, 0, 75);
$blue = imagecolorallocatealpha($image, 0, 0, 255, 75);

// drawing 3 overlapped circle
imagefilledellipse($image, $yellow_x, $yellow_y, $radius, $radius, $yellow);
imagefilledellipse($image, $red_x, $red_y, $radius, $radius, $red);
imagefilledellipse($image, $blue_x, $blue_y, $radius, $radius, $blue);

// don't forget to output a correct header!
header('Content-type: image/png');

// and finally, output the result
imagepng($image);
imagedestroy($image);
?>

It says cannot output image or something. It's because the $back = imagecolorallocatealpha should not be alpha.

How do I create a transparent PNG with alpha. I DO NOT want a background. I'd like to be able to mouse right click the image and save to my cpu and when I put it on any image, it will be transparent.

rafiki
07-18-2007, 03:22 PM
why not create the image with GIMP/PS, then you could manipulate it with php

kaisellgren
07-18-2007, 04:20 PM
This would be an alternative to ps. I'm creating simple graphs without my ps computer



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