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20 years ago
This example shows how to use imageCopyMerge to create a water mark function with four random positions (the corners).

<?php
function waterMark($fileInHD, $wmFile, $transparency = 50, $jpegQuality = 90, $margin = 5) {

 $wmImg   = imageCreateFromGIF($wmFile);
 $jpegImg = imageCreateFromJPEG($fileInHD);

 // Water mark random position
 $wmX = (bool)rand(0,1) ? $margin : (imageSX($jpegImg) - imageSX($wmImg)) - $margin;
 $wmY = (bool)rand(0,1) ? $margin : (imageSY($jpegImg) - imageSY($wmImg)) - $margin;

 // Water mark process
 imageCopyMerge($jpegImg, $wmImg, $wmX, $wmY, 0, 0, imageSX($wmImg), imageSY($wmImg), $transparency);

 // Overwriting image
 ImageJPEG($jpegImg, $fileInHD, $jpegQuality);
}

waterMark('myImage.jpg','waterMark.gif');

?>

HTH.

Javier Tac?n.
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