Hi All,
I apologise if this is a newbie post; i'm new to transparent graphics
(PNGs in my case).
I have a transparent PNG on disk, which I want PHP to load into memory
and add some text to ("watermarking", I guess). This seems to be what
is achieved @ http://php.ca/manual/en/image.examples.merged-watermark.php
I have taken the following code almost entirely from the manual, but
can not understand what I have done wrong:
<snip>
//Create the image
$img = @imagecreatetruecolor($width, $height)
or die("Cannot Initialize new GD image stream");
//Make it transparent
imagesavealpha($img, true);
$trans_colour = imagecolorallocatealpha($img, 0, 0, 0, 127);
imagefill($img, 0, 0, $trans_colour);
//Get the text color
$text_color = imagecolorallocate($img, 255, 0, 0);
//Draw the string
imagestring($img, $font_size, 0, 0, $string, $text_color);
// Load background image, find position, print
$img2 = imagecreatefrompng('xxx.png');
$yoffset = (imagesx($img2)/2) - (imagesx($img)/2);
imagecopymerge($img2, $img, $yoffset, 5, 0, 0, imagesx($img),
imagesy($img), 100);
// Output the merged images
header ("Content-type: image/png");
imagepng($img2);
</snip>
This code prints the background image with transparancy removed with a
light grey, and the text image in red on a black background in the
correct position.
If I change it to imagepng($img), the text image is printed correctly
(transparency and all)
Suggestions appreciated, i'm lost!
Many thanks,
Alex
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