Image compression


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Aug 17, 2007
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#1
Hello all,

i'm wondering if say I have a 10mpx camera and i choose to shoot at 8mpx, will it be less noisy?

i had some hope at first but after thinking about it, now my understanding is that since the no. of pixels is built (squashed!) into the ccd sensor so taking a picture at 8mpx doesn't reduce noise -

what the camera does is take a 10mpx picture, resize and save at 8mpx.

is that correct? :sweat:

:-(

thanks. :bigeyes:
 

grantyale

Senior Member
Oct 4, 2004
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Bedok
#2
10 MP and 8 MP aren't that different. The filtering process in downsampling does reduce noise though (at the expense of resolution).
 

calebk

Senior Member
Jul 25, 2006
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Clementi
#3
...
what the camera does is take a 10mpx picture, resize and save at 8mpx.

is that correct? :sweat:

:-(

thanks. :bigeyes:
Correct. So essentially, the image is still registering on your 10MP sensor wholesale, so the noise level is still pretty much the same. However, resizing does mean a smaller image, which gives the impression that there is less noise.
 

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