title: Colour correction of Photoshop LUT filter using CIFilter
body: <p>Using photoshop to create LUT filter and use iOS CIFilter to read the LUT image, filter image created by iOS is not corresponding to the filer image created by photoshop.</p>
  
  <p>How can I trace the issue?
  <img src="https://i.stack.imgur.com/PandZ.png" alt="enter image description here"></p>
  
  <p>This is the original image
  <img src="https://i.stack.imgur.com/j996b.jpg" alt="enter image description here"></p>
  
  <p>This is the image with filter I created from photoshop
  <img src="https://i.stack.imgur.com/tHHO5.png" alt="enter image description here"></p>
  
  <p>This is the image with filter I created from iPhone
  <img src="https://i.stack.imgur.com/CoFXo.jpg" alt="enter image description here"></p>
  
  <p>This is the LUT image I am using
  <img src="https://i.stack.imgur.com/527E9.png" alt="enter image description here"></p>