Question

Hi I have to flip a thumpnail image before merge it with another jpeg file. but when I rotate 45 degree using php. It shows a black background. how can I avoid that. any body can help me.

Answer 1

<?
$image = "130.jpg";
$degrees = 25;
for($i=0;$i<count($data);$i++){
    $ext = "";
    $extarr = "";
    $extarr = explode(".", $data[$i]['name']);
    $ext = array_pop($extarr);
    if($ext == "png"){
        $rotate = imagecreatefrompng("images/".$data[$i]['name']);
        $transColor = imagecolorallocatealpha($rotate, 255, 255, 255, 270);
        $watermark1[$i] = imagerotate($rotate, ((360-$degrees)%360), $transColor);
    }
}

function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $opct){
    $w = imagesx($src_im);
    $h = imagesy($src_im);
    $cut = imagecreatetruecolor($src_w, $src_h);
    imagecopy($cut, $dst_im, 0, 0, $dst_x, $dst_y, $src_w, $src_h);
    imagecopy($cut, $src_im, 0, 0, $src_x, $src_y, $src_w, $src_h);
    imagecopymerge($dst_im, $cut, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, (100 - $opct));
}


for($i=0; $i<count($watermark1); $i++){
    if($i == 0) imagecopymerge_alpha($image, $watermark1[$i], $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, $opacity);
    else imagecopymerge_alpha($image, $watermark1[$i], ($i*$dest_x)*3, ($i*$dest_y)*15, 0, 0, $watermark_width, $watermark_height, $opacity);
    imagedestroy($watermark1[$i]);
}
header("content-type: image/png");
imagepng($image);
imagedestroy($image);
?>

Also, do your watermark images have alpha channel or are they fully opaque?