Jump to content

Lamartine Cabral

Members
  • Posts

    5
  • Joined

  • Last visited

Posts posted by Lamartine Cabral

  1. Hmm just a guess but you might be an Android fan!

     

    Look I don't deny it can't be a cutting edge mobile OS for certain devices especially those from Samsung, but it doesn't have the same user experience as an iPhone.

     

    That you can't even visualise my idea for Panasonic, tells me that you don't really mind the tacky lack of visual appeal on the Android platform either.

     

    Have some imagination.

     

    A powered case that happens to have a 20MP 1" camera in it, clips to the back of the phone same as the extra juice cases do. That way I get to keep iOS and I get a better camera... and it would still end up thinner than the CM1

     

    1st: I am an android user but I do not hate iOS. I think it's great, actually.

    2nd: Samsung's TouchWiz are the android's shame. That's the one I really hate.

     

    3rd: I had got what you said about your idea for panasonic. I just expected you to see that this isn't even possible. It's easier for you to suggest kodak or polaroid to do so.

  2. Ok, so there are different explanations as to what is happening from the sensor to what is recorded.

    I will use my limited understanding to try and suppose what might be happening.

     

    The 5d mk3 is interesting in that its native horizontal photosite resolution is 5760 which happens to be 3 times 1920.

    which means that 9 photosites are being used (or should be being used) to get the values for one output pixel.

     

    The image bellow shows how this would apply to a small section of the sensor.

     

    attachicon.gif5d mk3 bayer pattern to 1920.bmp

     

    As you can see there are 4 possible pixel types.

     

    Thomas could be right in saying that the output is YUV.

    However RGB to YUV conversion could happen regardless of how the RGB values are obtained from the sensor in the first place.

     

    There are 3 rough methods I can think of for obtaining the RGB values:

     

    Method 1.

    The most information would be obtained by reading all photosites of a particular colour and averaging them to obtain a colour value for that output pixel.  All photosites would be used.  So for example in the top left group of 9 photosites, 5 green samples would be averaged to for the green value, and 2 blue and 2 red samples would be averaged for their respective values.

     

    Method 2.

    If however Andrew is correct that no calculation is done on camera,

    then this would mean only 1 photosite from each group of 9 would be used for each output colour value.  Meaning you are throwing away 2 thirds of the sensor information and therefore 2 thirds of light gathering ability / noise performance.

     

    Method 3.

    Or if it turns out the final image still needs debayering then this means only one colour is being recorded for each group of 9 photosites.  Which means only 1 photosite out of 9 is used:      8/9ths of the information thrown away!

     

    If Method 3 is the case then I would say this is quite poor.

    A 4K raw frame from the 4kBMPC from would offer 4 times the resolution (even after downscaling the BMPC) and 3.1 times the light gathering ability (taking into account sensor area difference of 2.9* but not photosite size)

     

    If method 2 is true then the 5D MK3 and 4K BMPC will be fairly evenly matched in terms of resolution and light gathering ability.

     

    If the Method 1 true, which is probably unlikely, then the 5D would be simply beastly.

     

    It will be interesting to see what the case is.

    I think that a way to put this in test is just compare the amount of noise of a 1920x1280 fullframe raw with a 1920x1280 1:1 raw. Can anyone do this?

×
×
  • Create New...