Rotate a PNG then resave with Image Transparency - php

Question

I'm having some major issues getting PNG transparency on a PNG that is being rotated.
$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've 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
rotated -45 degrees, new areas with ~50% opacity for a demo
$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