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8MP pictures are all less that 1MB in size

Discussion in 'Motorola Droid Bionic' started by dcruff, Oct 5, 2011.

  1. dcruff
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    dcruff New Member

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    Is it really possible for an 8MP picture to be that small of a file size. The pictures don't even appear to be of a high resolution. They look less than 2MP.
  2. tgyberg
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    tgyberg Well-Known Member

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    Have you pulled one off of your phone and checked the size? It's got to be bigger than 1mb.
  3. dcruff
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    dcruff New Member

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    Yep, that's when I first noticed the small file size. Then I looked at the DCIM folder on the phone and verified that the pictures were all around 900k.
  4. tgyberg
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    tgyberg Well-Known Member

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    I've got one here that is 3264x1840 and it's 2.12mb. And that was with my camera set at 6mp.
  5. dcruff
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    dcruff New Member

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    I'm set at 8MP and I just cleaned the lens and got a new picture at 1554 KB. Still much smaller than it should be.
  6. dcruff
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    dcruff New Member

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    Actually, I had it wrong. At 6MP (wide screen) all of my pictures are about 950k. Now when I choose 8MP, the pictures are about 1.5MB
  7. dcruff
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    dcruff New Member

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    I just took another 8MP picture indoors with the flash and the picture came in at 1200 KB
  8. Arkbird
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    Arkbird DF News Team Premium Member

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    You guys have to remember how small the sensors are in these things. They aren't going to be 5mbs you're used to with your camera because they aren't picking up as much detail with the smaller sensor.
  9. dcruff
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    dcruff New Member

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    I understand that, but 8MP is 8MP. Doesn't each pixel take the same amount of bytes no matter how small the sensor is?
  10. tgyberg
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    tgyberg Well-Known Member

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    My shot that made it over 2mb was an outdoor landscape shot. A lake with lots of greens and I think that's why it was bigger.
  11. dcruff
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    dcruff New Member

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    I'll have to try it again tomorrow during the day. But I still thought that the file size should have been bigger. Thanks.
  12. C3-PO
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    I'm sure it has to do with the compression algorithm that the phone is using. Try taking a picture with lots of different contrasting colors and see if this affects the file size.
  13. kptphalkon
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    kptphalkon New Member

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    If the picture has a lot of the same/similar color, it will be smaller. Jpeg compression works like heuristic file compression.
  14. lykofos
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    lykofos New Member

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    The file sizes you are getting are pretty spot on for an 8mp phone camera. I do photography as a side business and a lot of people get confused by this. Megapixels (MP) and megabytes (MB) are not the same thing and are not really directly correlated to one another.

    Megapixels are the unit of measurement for the sensor image resolution while megabytes are the unit of measurement for data storage. As others said, the saved size of your image depends on the phone's jpeg compression algorithm and how much detail, color, lighting, etc. are in the photo. Now if you're saving in a RAW format (which most basic cameras don't do), then you're file sizes would be much larger b/c there's no compression going on.
  15. tgyberg
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    tgyberg Well-Known Member

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    ^ That would be hilarious of a phone came with the RAW format option! Maybe one day!
  16. dcruff
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    dcruff New Member

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    I guess that my camera is working as spec'd. I just took an outdoors picture with lots of grass, trees and flowers. The file size is 2626 KB. The picture quality has improved remarkably since I cleaned the lens with a microfiber cloth. I had a similar problem with my first Droid until I cleaned the lens.
  17. Anomander
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    Anomander New Member

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    Great explanation on the differences. It would be interesting to have the option to save as a raw file instead of jpeg since there are more editing options in Lightroom for raw files. What camera do you shoot with?
  18. lykofos
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    lykofos New Member

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    That would be a very cool option to save it as RAW and the SD card included with the phone is plenty big enough. Unfortunately, there probably will never be enough demand for a feature like that for them to include the option for a phone camera.

    My primary is a Canon 40D and I also have a 20D as a back-up. You do photography too?
  19. yiannis
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    yiannis New Member

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    Certainly not. Without factoring in the compression, a larger sensor will have larger pixels for the same number of pixels. It's not quite a linear thing because pixel pitch is not the same, but larger pixels mean bigger, and better, images. Again for starters they can collect far more light than smaller pixels.

    Having said that, 8 MP -> 1.4 MB seems as an aggressive compression.
  20. nmos
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    nmos New Member

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    Hold on there. The physical size of the pixels in the sensor have nothing to do with the amount of space (in MB) needed to store the resulting image.


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