php - losing quality and size , after adding watermark to image -


i'm working on website didn't create/develop.

users can upload image , when that, there's function creates duplicate of image watermark.

but copy watermark of low quality , size smaller original image

without watermark

with watermark

function watermark( $path ){     $watermark = imagecreatefrompng('files/watermark.png');     $wmsize = getimagesize('files/watermark.png');     $image = imagecreatefromjpeg($path);     $size  = getimagesize($path);      $dest_x = (8);     $dest_y =  ($size[1] - 35  );      imagecopy($image, $watermark, $dest_x, $dest_y, 0, 0, $wmsize[0], $wmsize[1]);      ob_start();      imagejpeg($image);      $img2 = ob_get_contents();      ob_end_clean();      imagedestroy($image);     return $img2 ; }

the image quality decreased because of jpeg compression.

every time save image jpeg decrease quality because jpeg uses lossy compression. can minimize loss setting compress quality 100%, if perform lossless compression not possible jpeg , must image format, e.g. tiff.


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