Question

I’m using the script below to create an JPG based on people uploading an image. What happens is that even if an image is the exact same width/height it still loses quality so much that it’s unacceptable.

$im = imagecreatefromjpeg($_FILES['cpicture']['tmp_name']);
$thumb=imagecreatetruecolor(507,307);
ImageCopyResampled($thumb,$im,0,0,0,0,$newwidth,$newheight,ImageSX($im),ImageSY($im));
ImagejpeG($thumb,"uploads/".$randomvalue.".jpg");
$imgurl="uploads/".$randomvalue.".jpg";

Are these functions reducing the quality?

Answer 1

imagejpeg‘s third parameter is the quality of the image to be output:

quality is optional, and ranges from 0 (worst quality, smaller file) to 100 (best quality, biggest file). The default is the default IJG quality value (about 75).

Try changing the relevant line of your code to:

ImagejpeG($thumb,"uploads/".$randomvalue.".jpg", 100);