1. LumiaChemist's Avatar
    In my last post i pointed out how the portico image process maybe work
    http://forums.windowscentral.com/nok...ml#post2018414

    Now i want to show you how to improve your image quality.
    Signal to Noise Ratio will be a lot better meaning less noise and more sharpness.
    All this without image stacking.

    Step 1:
    First open up your image in photoshop's raw converter.
    step1.jpg
    In this first tab i played a bit with the settings to give the image better makro and micro contrast.

    Step 2:
    Go to the third tab.
    step2.jpg
    For Luminace Noise you want something between 10-20. A good value for Color Noise is 15.
    Press the button Open Image to confirm.

    Step 3:
    Filter>Noise>Reduce Noise
    step3.jpg
    Its import to use only very small values in the first two sliders because Photoshops Denoise Tool is very strong

    Step 4:
    Blow up the Image Resolution by 300%
    step4.jpg

    Step 5,6,7:
    Use Filter>Sharpen>Smart Sharpen with those values:
    step5.jpg

    Step 8:
    Filter>Stylize>Diffuse with Anisotropic picked
    step6.jpg

    Step 9:
    Resize to original Resolution
    step7.jpg
    Use Bicubic Sharper for best results.



    Now lets look at the results

    compare_1.jpg compare_2.jpg compare_3.jpg

    Increased sharpness without noise, or with much less noise, thats something!


    wp_20130705_001.jpg wp_20130705_001_opti.jpg

    wp_20130515_001.jpg wp_20130515_001.jpg
    Attached Thumbnails wp_20130517_007.jpg  
    barareklam likes this.
    07-07-2013 07:28 AM
  2. Laura Knotek's Avatar
    That would be something that could be done in Photoshop no matter what device one used to take the pictures. It would work with cameras too.
    ttsoldier and JonnieLasVegas like this.
    07-07-2013 12:58 PM
  3. LumiaChemist's Avatar
    Whats your point? Sure you can, i have already done it with iphone 5 pictures of a friend of mine.
    07-07-2013 01:45 PM
  4. johninsj's Avatar
    Whats your point? Sure you can, i have already done it with iphone 5 pictures of a friend of mine.
    His point is this isn't improving the Lumia 920's image quality. It's just massaging the bits. The image quality is what comes out of the camera. Post processing isn't.

    The best bet for improving image quality in the 920 is to not use Auto. Force a low ISO in brightly lit settings to cut down on graininess. Use sports mode to force a faster shutter (and a higher ISO if the light is bad) to reduce blur.Those are the only two things you can do to improve the image quality.
    07-08-2013 08:45 AM
  5. LumiaChemist's Avatar
    So what you say is image stacking, dark frame substraction, focus stacking, oversampling, etc which are all post processing steps dont increase image quality or psnr?
    Nokia uses an anisotropic filter in his image processing, when you do image stacking with a post portico image you will see very similar results as with my method.
    Only if you go far beyond 8-16 stacked images you will see a really improvement in the dark areas of the final stacking result.

    Try it, use fitswork for example
    and for now, here are three images to underline what i am saying.

    first: this is one out of 80 images i took with proshot in timelapse modus.
    wp_0.jpg

    the next image is the result from stacking 80 pictures. 80 pictures is a lot and the downside here is, you need a tripod, you need time and if something in your image moves
    you can see a blur in the final result.
    zielbild.jpg

    and finaly the first image: gone through the steps i described. the dark areas lose quality but where detail existed the image noise is near the minimum in the stacked image and the sharpness is way greater because there is no blur because of moving objects.
    wp_0_ani300.jpg



    i get your point what you want to say with

    It's just massaging the bits. The image quality is what comes out of the camera. Post processing isn't.
    what i am trying to say is, this is different with the portico update. The lumia 920 already filtered the raw image with some sort of anisotropic filtering.

    A way to really improve image quality would be saving the image in a raw format.
    07-08-2013 09:43 AM
  6. barareklam's Avatar
    if you can make app for this that would be something :)
    first one to buy :)
    07-12-2013 07:44 AM

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