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Photo resize question


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I'm saving two photos from an upload. One is a larger photo and the other is a thumb.


I was wondering if i used less resources to create the thumb copy of a photo from the reduced larger photo say 450*400 or create the thumb from the original that can be say 3mb and say 2500px * whatever or is it 6 one way or a half dozen another?


   imagecopyresampled($photo, $source, 0, 0, 0, 0, $photo_width, $photo_height, $width, $height);
//   imagecopyresampled($thumb_photo, $source, 0, 0, 0, 0, $thumb_width, $thumb_height, $width, $height); // OLD WAY
   imagecopyresampled($thumb_photo, $photo, 0, 0, 0, 0, $thumb_width, $thumb_height, $photo_width, $photo_height);


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