Read the manual! You have to first obtain an image resource, returned by one of the image creation functions, such as imagecreatefrompng(): $file = $PNG_WEB_DIR.basename($filename); $img = imagecreatefrompng($file); // … ob_start(“output_handler”); imagepng($img,NULL,9); $image_data = ob_get_contents(); ob_end_flush(); 4 solved imagepng() expects parameter 1 to be resource [closed]
In Internet Explorer 6 and below, transparetn pngs do not show correctly. The transparent part of the png is not transparent but a solid color. Anyways to fix that problem add this code to your head tag. <script language=”JavaScript”> function correctPNG() // correctly handle PNG transparency in Win IE 5.5 & 6. { var arVersion … Read more
Standard PNGs don’t support editing. Simplifying it a bit, they are just what you said they are: losslessly compressed bitmaps (vs JPGs, which employ lossy compression, or GIFs which are also bitmaps, but only support up to a 256 color palette). Fireworks PNGs contain a special header and extra data that allows them to retain … Read more