Watermark Your Images with another Image Using PHP and GD Library
This php code sample demonstrates the use of GD library to watermark images on the fly. The uploaded image is superimposed with another image, preferably a transparent PNG image. You can modify and use this example to copy protect your images by imprinting your copyright/logo image over uploaded images (just like Corbis and GettyImages). This example supports 256 color, transparent png images as watermark source. The target images can be gif, jpeg or png images.
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