note 88456 added to function.imagecopymerge

/** * PNG ALPHA CHANNEL SUPPORT for imagecopymerge(); * This is a function like imagecopymerge but it handle alpha channel well!!! **/ // A fix to get a function like imagecopymerge WITH ALPHA SUPPORT // Main script by aiden dot mail at freemail dot hu // Transformed to imagecopymerge_alpha() by rodrigo dot polo at gmail dot com function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct){ if(!isset($pct)){ return false; } $pct /= 100; // Get image width and height $w = imagesx( $src_im ); $h = imagesy( $src_im ); // Turn alpha blending off imagealphablending( $src_im, false ); // Find the most opaque pixel in the image (the one with the smallest alpha value) $minalpha = 127; for( $x = 0; $x < $w; $x++ ) for( $y = 0; $y < $h; $y++ ){ $alpha = ( imagecolorat( $src_im, $x, $y ) >> 24 ) & 0xFF; if( $alpha < $minalpha ){ $minalpha = $alpha; } } //loop through image pixels and modify alpha for each for( $x = 0; $x < $w; $x++ ){ for( $y = 0; $y < $h; $y++ ){ //get current alpha value (represents the TANSPARENCY!) $colorxy = imagecolorat( $src_im, $x, $y ); $alpha = ( $colorxy >> 24 ) & 0xFF; //calculate new alpha if( $minalpha !== 127 ){ $alpha = 127 + 127 * $pct * ( $alpha - 127 ) / ( 127 - $minalpha ); } else { $alpha += 127 * $pct; } //get the color index with new alpha $alphacolorxy = imagecolorallocatealpha( $src_im, ( $colorxy >> 16 ) & 0xFF, ( $colorxy >> 8 ) & 0xFF, $colorxy & 0xFF, $alpha ); //set pixel with the new color + opacity if( !imagesetpixel( $src_im, $x, $y, $alphacolorxy ) ){ return false; } } } // The image copy imagecopy($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h); } // USAGE EXAMPLE: $img_a = imagecreatefrompng('image1.png'); $img_b = imagecreatefrompng('wm2.png'); // SAME COMMANDS: imagecopymerge_alpha($img_a, $img_b, 10, 10, 0, 0, imagesx($img_b), imagesy($img_b),50); // OUTPUT IMAGE: header("Content-Type: image/png"); imagesavealpha($img_a, true); imagepng($img_a, NULL); ---- Server IP: 69.147.83.197 Probable Submitter: 190.56.144.26 ---- Manual Page -- http://www.php.net/manual/en/function.imagecopymerge.php Edit -- https://master.php.net/note/edit/88456 Del: integrated -- https://master.php.net/note/delete/88456/integrated Del: useless -- https://master.php.net/note/delete/88456/useless Del: bad code -- https://master.php.net/note/delete/88456/bad+code Del: spam -- https://master.php.net/note/delete/88456/spam Del: non-english -- https://master.php.net/note/delete/88456/non-english Del: in docs -- https://master.php.net/note/delete/88456/in+docs Del: other reasons-- https://master.php.net/note/delete/88456 Reject -- https://master.php.net/note/reject/88456 Search -- https://master.php.net/manage/user-notes.php