only 75% jpg quality - image.inc with GD

I agree - just trying imagecache right now, and its very useful, except for the awful quality of scaled pictures. I mean, it's like jpeg quality 20 or something. I'd love to have an option to set quality!

Ok, tracked down the source of this problem down to image.inc, so its not an imagecache / imagefield problem.

in function image_gd_close($res, $destination, $extension), the imagejpeg() function (in the case of a jpg file) takes only 2 arguments. In the documentation (http://ca.php.net/function.imagejpeg), there`s a third parameter for quality; if its omitted, a value of 75 is used (which as we saw, is pretty ugly looking).

We should patch image.inc to allow for custom quality jpeg settings.

In the meantime, I just use :

function image_gd_close($res, $destination, $extension) {
  $extension = str_replace('jpg', 'jpeg', $extension);
  $close_func = 'image'. $extension;
  if (!function_exists($close_func)) {
    return FALSE;
  }
  if($extension == 'jpeg')
  {  return $close_func($res, $destination, 100); }
  else
  return $close_func($res, $destination);
}

Anyone have the necessary knowledge to patch image.inc?

Also, the original bug reporter said that he was using imagemagick, so its not only GD. My solution is only against GD, but Im sure it will be very similar for imagemagick.

/subscribed. I recently hacked this into an installation. Better description.

Duplicate of http://drupal.org/node/105164