note 89987 added to function.imagecopyresampled

Resampling GIFs and retain transparency dosen't work always, as dependent on the resample factor the resulting resampled image has some pattern-noise that prevents "imagegif" to find all the transparent-pixels. One way to fix this, is to reset all pixels with high alpha to full-transparent: <?php // load/create images $img_src=imagecreatefromgif($g_srcfile); $img_dst=imagecreatetruecolor($g_iw,$g_ih); imagealphablending($img_dst, false); // get and reallocate transparency-color $transindex = imagecolortransparent($img_src); if($transindex >= 0) { $transcol = imagecolorsforindex($img_src, $transindex); $transindex = imagecolorallocatealpha($img_dst, $transcol['red'], $transcol['green'], $transcol['blue'], 127); imagefill($img_dst, 0, 0, $transindex); } // resample imagecopyresampled($img_dst, $img_src, 0, 0, 0, 0, $g_iw, $g_ih, $g_is[0], $g_is[1]); // restore transparency if($transindex >= 0) { imagecolortransparent($img_dst, $transindex); for($y=0; $y<$g_ih; ++$y) for($x=0; $x<$g_iw; ++$x) if(((imagecolorat($img_dst, $x, $y)>>24) & 0x7F) >= 100) imagesetpixel($img_dst, $x, $y, $transindex); // save GIF imagetruecolortopalette($img_dst, true, 255); imagesavealpha($img_dst, false); imagegif($img_dst, $g_dstfile); imagedestroy($img_dst); ?> ---- Server IP: 194.153.94.10 Probable Submitter: 83.79.86.120 ---- Manual Page -- http://www.php.net/manual/en/function.imagecopyresampled.php Edit -- https://master.php.net/note/edit/89987 Del: integrated -- https://master.php.net/note/delete/89987/integrated Del: useless -- https://master.php.net/note/delete/89987/useless Del: bad code -- https://master.php.net/note/delete/89987/bad+code Del: spam -- https://master.php.net/note/delete/89987/spam Del: non-english -- https://master.php.net/note/delete/89987/non-english Del: in docs -- https://master.php.net/note/delete/89987/in+docs Del: other reasons-- https://master.php.net/note/delete/89987 Reject -- https://master.php.net/note/reject/89987 Search -- https://master.php.net/manage/user-notes.php