Efficient JPEG Image Resizing in PHP

Question :

Efficient JPEG Image Resizing in PHP,

Answer :

What’s the most efficient way to resize large images in PHP?

I’m currently using the  function imagecopyresampled to take high resolution images, and cleanly resize them down to a size for web viewing (roughly 700 pixels wide by 700 pixels tall).

This works great on small (under 2 MB) photos and the entire resize operation takes less than a second on the server. However, the site will eventually service photographers who may be uploading images up to 10 MB in size (or images up to 5000×4000 pixels in size).

Doing this kind of resize operation with large images tends to increase the memory usage by a very large margin (larger images can spike the memory usage for the script past 80 MB). Is there any way to make this resize operation more efficient? Should I be using an alternate image library such as

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Right now, the resize code looks something like this

function makeThumbnail($sourcefile, $endfile, $thumbwidth, $thumbheight, $quality) {      // Takes the sourcefile (path/to/image.jpg) and makes a thumbnail from it      // and places it at endfile (path/to/thumb.jpg).        // Load image and get image size.      $img = imagecreatefromjpeg($sourcefile);      $width = imagesx( $img );      $height = imagesy( $img );        if ($width > $height) {          $newwidth = $thumbwidth;          $divisor = $width / $thumbwidth;          $newheight = floor( $height / $divisor);      } else {          $newheight = $thumbheight;          $divisor = $height / $thumbheight;          $newwidth = floor( $width / $divisor );      }        // Create a new temporary image.      $tmpimg = imagecreatetruecolor( $newwidth, $newheight );        // Copy and resize old image into new image.      imagecopyresampled( $tmpimg, $img, 0, 0, 0, 0, $newwidth, $newheight, $width, $height );        // Save thumbnail into a file.      imagejpeg( $tmpimg, $endfile, $quality);        // release the memory      imagedestroy($tmpimg);      imagedestroy($img)

,

People say that ImageMagick is much faster. At best just compare both libraries and measure that.

  1. Prepare 1000 typical images.
  2. Write two scripts — one for GD, one
    for ImageMagick.
  3. Run both of them a few times.
  4. Compare results (total execution
    time, CPU and I/O usage, result
    image quality).
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Something which the best everyone else, could not be the best for you.

Also, in my opinion, ImageMagick has much better API interface.

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Disclaimer :

The answers provided above are only to be used to guide the learning process. The questions above are open-ended questions, meaning that many answers are not fixed as above. I hope this article can be useful, Thank you

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