Pixel binning/burst rate/ Quality

jaomul

Been spending a lot of time on here!
Joined
Feb 4, 2011
Messages
5,715
Reaction score
1,554
Location
Cork Ireland
Can others edit my Photos
Photos OK to edit
Hi all,

I have read this term pixel binning and I am wondering if anyone could tell me if I am interpreting it correctly. I understand this as combining pixels when you decrease the sensors native resolution. (or does it just dump a percentage completely?)
Does this in turn mean that if you select say a medium size raw file that the quality of the final image should be of similar quality to a full size raw albeit with a decreased resolution? (or is it a lesser quality image due less light catchers?)

It seems that my cameras burst rate increases with lower size files and in situations where a half sized resolution image is more than enough, am in losing just resolution or sacrificing the image in other areas also?,
Thanks
 

Patrice

No longer a newbie, moving up!
Joined
Dec 6, 2006
Messages
2,392
Reaction score
381
Location
Campbellton, New Brunswick, Canada
A preliminary search had these pages as a starting point to find the answer. I don't have a lot of time right now to do this reading to see if the answer is there, why don't you have a go and then inform the rest of us. You asked the question and I'm sorry but I don't have the time today to read this stuff for you.

CCD University
PixelBinning
Hamamatsu Learning Center: Pixel Binning
Binning
Binning
http://www.cmosis.com/assets/pdf/publications/slides-cmosis-eos-june2009.pdf
http://www.cmosis.com/assets/pdf/publications/slides-cmosis-eos-june2009.pdf
 
OP
jaomul

jaomul

Been spending a lot of time on here!
Joined
Feb 4, 2011
Messages
5,715
Reaction score
1,554
Location
Cork Ireland
Can others edit my Photos
Photos OK to edit
Those links are all very scientific and maths orientated.They don't go into the quality of the image afterwards. I tried to find info on this before I asked but couldn't which is why I asked here. Thanks
 

480sparky

Chief Free Electron Relocator
Supporting Member
Joined
Mar 8, 2011
Messages
24,760
Reaction score
8,806
Location
Iowa
Website
www.imaginationimagesofiowa.com
Can others edit my Photos
Photos NOT OK to edit
The sensors in your DSLR are color blind. They would normally see all colors equally and end up recording the scene in shades of gray. To make each sensor photosite "see" in color, each one has a colored filter on top of it so it records only a certain color (red, green or blue) of light.

Image_Sensor_1edit.jpg




In order to create an RGB pixel in the image, the processor combines the information from 4 adjacent sensor pixels to create a single image pixel. In this image, the data from photosites #s 1,2,5 and 6 are combined, or "pixel binned". The process is repeated for photosites # 2, 3, 6 and 7, then again for 3, 4, 7 and 8.....

PixelLayoutBayerArray1256.jpg
 

nmoody

TPF Supporters
Supporting Member
Joined
Nov 15, 2011
Messages
849
Reaction score
143
Location
SF Bay Area, CA
Can others edit my Photos
Photos OK to edit
Nice! Thanks for sharing that Sparky
 

KmH

In memoriam
Supporting Member
Joined
Apr 9, 2009
Messages
41,401
Reaction score
5,702
Location
Iowa
Website
kharrodphotography.blogspot.com
Can others edit my Photos
Photos OK to edit
... the processor combines the information from 4 adjacent sensor pixels to create a single image pixel.
PixelLayoutBayerArray1256.jpg
The luminosity recorded by image sensor pixels 1, 2, 5, and 6 is combined by the demosacing algorithm to make 4 image pixels, not just 1 image pixel, and all 4 image of those image pixels can have much different tones if they are on a high contrast edge as opposed to all 4 being part of nice smooth gradient in the sky.

The algorithm decides what color image pixel 1 needs to be based on the luminosity all 4 pixels in the Bayer Array of 2 green, 1 blue, and 1 red filters. The algorithm does the same for pixels 2, 5, and 6.

Here are some image pixels, and the part of the image they represent:

PixelScreenShot.jpg




Sampleb.jpg
 
OP
jaomul

jaomul

Been spending a lot of time on here!
Joined
Feb 4, 2011
Messages
5,715
Reaction score
1,554
Location
Cork Ireland
Can others edit my Photos
Photos OK to edit
Ok. So is a 10mp raw file from an 18mp sensor as good in quality but just a lower resolution or not? Is an accurate yes or no answer possible, or is it a not black or white type answer?
 

KmH

In memoriam
Supporting Member
Joined
Apr 9, 2009
Messages
41,401
Reaction score
5,702
Location
Iowa
Website
kharrodphotography.blogspot.com
Can others edit my Photos
Photos OK to edit
Ok. So is a 10mp raw file from an 18mp sensor as good in quality but just a lower resolution or not? Is an accurate yes or no answer possible, or is it a not black or white type answer?
It is indeed a 'it depends' situation.

Define 'image quality'. Which Raw processor is doing the conversion. Each uses it's own slightly different algorithms, so a Raw file converted in ACR looks a bit different from the same Raw file converted using DPP.
 

Most reactions

New Topics

Top