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09/28/2004 06:46:14 PM · #1 |
is raw the only way to use all 6 megapixals?
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09/28/2004 06:49:07 PM · #2 |
Yeah I think so. Jpeg fine is pretty good also. Really dont need 6mp for most shots.
Travis
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09/28/2004 07:48:02 PM · #3 |
The 6 MegaPixels should be an indication of the size of the output file, not the format. If the jpg output is the the same size as the RAW, it is using every available pixel -- it is just doing more to them (in jpg) before you see them.
David
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09/28/2004 09:46:19 PM · #4 |
you always use all 6 megapixels. like britannica said. on the d70, when you shoot in RAW or in Large JPG (any quality) you end up with a 3008x2000 image. when you crank the jpg sizes down, then you end up with a less than 6mp image in the end.
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09/29/2004 12:11:21 AM · #5 |
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09/29/2004 12:26:44 AM · #6 |
It's a bit more complicated than that, actually. The RAW file has 6 megapixels, BUT THE EACH OF THOSE IS ONLY A SINGLE COLOR. Red, green, or blue. The pixels on the camera sensor are arranged in what is called a Bayer pattern and it looks like this:
G R G R G R
B G B G B R
G R G R G R
B G B G B R
G R G R G R
The problem with this is that each of the 6 million pixels in the image file is an approximation of the color at that point. There is twice the resolution in the green channel, which results in greatly reduced noise in the green channel.
The RAW files capture the Bayer pattern data virtually straight from the sensor. JPEG files are always post-interpolation.
The interpolation results in reduced resolution (it's not really 6 megapixels!! the output file is, but they are only approximations.) and often moire artifacts.
Some new cameras avoid the Bayer pattern and layer the sensor elements of the CCD one in front of the other, like a recent Fuji (I think) camera.
see also:
//www.nezumi.demon.co.uk/photo/bayer/bayer.htm
//www.siliconimaging.com/RGB%20Bayer.htm
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09/30/2004 02:34:56 AM · #7 |
Not quite. 3008x2000=6016000 or 6 megapixels -- each pixel in the final image is interpolated from these four colored sensors; 1 blue, 1 red and 2 green to each 2x2 area as shown above. There are a number of ways to interpolate the data, but every picture taken uses all of the above sensors -- with the differences being the interpolation. Even with jpgs of reduced dimensions they start with the full 6 megapixels.
The only difference between RAW and any other format is where you want to do the conversion to an actual image format -- in camera or in the capture software. Using RAW and capture software provides much more control over the interpolation process, but does not use more sensors to capture the image originally.
David
/edit: clarity
Message edited by author 2004-09-30 02:49:46.
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09/30/2004 09:35:22 AM · #8 |
Originally posted by mrsamsa:
is raw the only way to use all 6 megapixals? |
no, your highest quality jpeg setting should yeild full use of
effective pixels. The largest difference between RAW and Fine jpeg
is that the RAW is unedited 12 bit and the jpeg is edited 8 bit |
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