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POHow to speed up image resizing in a CodeIgniter PHP application?
 

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  1. POHow to speed up image resizing in a CodeIgniter PHP application?
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    <p>I have an application that allows users to upload images. The test case I use is a jpeg of 1.6MB with dimensions 3872 x 2592px. The upload script in the back-end will resize the uploaded image into 6 additional formats:</p> <ul> <li>square (small 75 x 75)</li> <li>Small Thumb (50 x 38)</li> <li>Thumb (100 x 76)</li> <li>Small (240 x 161)</li> <li>Medium (500 x 378)</li> <li>Large (1024 x 774)</li> </ul> <p>I know it's a lot but trust me, I need this. I do the resizing using Code Igniter's Image Manipulation class, which uses either GD, GD2 or ImageMagick to do the resizing. I first configured it to use GD2 and noticed that the total resize process takes 11 secs.</p> <p>Since the user has to wait for this process, it is not acceptable. After a lot of reading I learned that ImageMagick is a much faster and efficient manipulation library, so I switched to that:</p> <pre><code>$sourceimage = $data['filedata']['file_path'] . $data['imagedata']['user_id'] . "/" . $imageid . $data['filedata']['file_ext']; $resize_settings['image_library'] = 'imagemagick'; $resize_settings['library_path'] = '/usr/bin'; $resize_settings['source_image'] = $sourceimage; $resize_settings['maintain_ratio'] = false; $resize_settings['quality'] = "100%"; $this-&gt;load-&gt;library('image_lib', $resize_settings); </code></pre> <p>Much to my surprise, the resize process now takes longer: 15 secs to be specific.</p> <p>Having a look at my log I see that each resize action takes 2 seconds, no matter the file format it is resizing to. I guess this is because I always resize from the original, which is very large. </p> <p>I would hate to offload the resizing process to a scheduled process, because that would decrease the usability of the site. It would mean that users have to wait a few minutes before they can start seeing/working with the image.</p> <p><strong>So, are there any smart ways to dramatically speed up this resizing process so that I can keep it in real-time? Just be clear: allowing for smaller resolutions is not an option, this is a photography site I'm building. Also, I really need the six formats mentioned.</strong></p>
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    1. COAny chance you could provide us the 1.6MB original JPEG image?
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      1. USAlix Axel
 

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