Rotate PNG, then save using image transparency

Question

I have some basic problems with PNG transparency in PNG that rotates.

$filename = 'bird_up.png'; $source = imagecreatefrompng($filename) or die('Error opening file '.$filename); imagealphablending($source, false); imagesavealpha($source, true); $rotation = imagerotate($source, $degrees, imageColorAllocateAlpha($source, 0, 0, 0, 127)); imagealphablending($source, false); imagesavealpha($source, true); header('Content-type: image/png'); imagepng($rotation); imagedestroy($source); imagedestroy($rotation); 

Answer 1

I added a working commented version below

 <?php // this file writes the image into the http response, // so we cant have any output other than headers and the file data ob_start(); $filename = 'tibia.png'; $degrees = 45; // open the image file $im = imagecreatefrompng( $filename ); // create a transparent "color" for the areas which will be new after rotation // r=0,b=0,g=0 ( black ), 127 = 100% transparency - we choose "invisible black" $transparency = imagecolorallocatealpha( $im,0,0,0,127 ); // rotate, last parameter preserves alpha when true $rotated = imagerotate( $im, $degrees, $transparency, 1); // disable blendmode, we want real transparency imagealphablending( $rotated, false ); // set the flag to save full alpha channel information imagesavealpha( $rotated, true ); // now we want to start our output ob_end_clean(); // we send image/png header( 'Content-Type: image/png' ); imagepng( $rotated ); // clean up the garbage imagedestroy( $im ); imagedestroy( $rotated ); 

Demo Original Image from Wikipedia

-45 degrees rotated, new areas with opacity ~ 50% for demonstration

 $transparency = imagecolorallocatealpha( $im,0,0,0,55 ); 

rotated -45 degress, new areas with 100% opacity

 $transparency = imagecolorallocatealpha( $im,0,0,0,127 ); 

Answer 2

 <?php $text ="New"; $font = "fonts/AARDV.ttf"; $size = 100; function html2rgb() { $color='FF0000'; if(strlen($color)==6) list($r, $g, $b)=array($color[0].$color[1],$color[2].$color[3],$color[4].$color[5]); elseif (strlen($color) == 3) list($r, $g, $b) = array($color[0].$color[0], $color[1].$color[1], $color[2].$color[2]); else return false; $r = hexdec($r); $g = hexdec($g); $b = hexdec($b); return array($r, $g, $b); } $c=html2rgb(); $bbox = imagettfbbox($size, 0, $font, $text); $width = abs($bbox[2] - $bbox[0]); $height = abs($bbox[7] - $bbox[1]); $image = imagecreatetruecolor($width, $height); $bgcolor = imagecolorallocate($image, 1, 1,0); imagecolortransparent($image, $bgcolor); $color = imagecolorallocate($image, $c[0],$c[1],$c[2]); $x = $bbox[0] + ($width / 2) - ($bbox[4] / 2); $y = $bbox[1] + ($height / 2) - ($bbox[5] / 2); imagefilledrectangle($image, 0, 0, $width - 1, $height - 1, $bgcolor); imagettftext($image, $size, 0, $x, $y, $color, $font, $text); $last_pixel= imagecolorat($image, 0, 0); for ($j = 0; $j < $height; $j++) { for ($i = 0; $i < $width; $i++) { if (isset($blank_left) && $i >= $blank_left) { break; } if (imagecolorat($image, $i, $j) !== $last_pixel) { if (!isset($blank_top)) { $blank_top=$j; } $blank_left=$i;break; } $last_pixel=imagecolorat($image, $i, $j); } } $x -= $blank_left; $y -= $blank_top; imagefilledrectangle($image, 0, 0, $width - 1, $height - 1, $bgcolor); imagettftext($image, $size, 0, $x, $y, $color, $font, $text); header('Content-type: image/png'); $transparency = imagecolorallocatealpha( $image,0,0,0,127 ); $image=imagerotate($image, 10, $transparency, 1); imagealphablending( $image, false ); imagesavealpha( $image, true ); ob_end_clean(); imagepng($image); imagedestroy($image); ?> This one not work..Black color any one please answer this.. enter code here