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does 2 mega pixels matter... 6 or 8
I am looking at to different Digital SLR cameras, Nikon D40 (that only has 6 mega pixels) and a Canon rebel XT ( 8 mega pixels). Will the different in pixels make a differents in the quality of my pictures?..

Comments (12)

Nope, you'll never be able to tell the difference unless you are doing some very heavy cropping or printing to some ridiculous size...

Comment #1

Ericbertrand wrote:.

I am looking at to different Digital SLR cameras, Nikon D40 (thatonly has 6 mega pixels) and a Canon rebel XT ( 8 mega pixels). Willthe different in pixels make a differents in the quality of mypictures?.

Not much difference. If you multiplied the 6mp image 4x to be 24mp, then you would have a noticeable difference, if printing very large prints larger than 8x10 inches..

6mp is 3008x2000 pixels and 8mp is 3456x2304 pixels. The idea is that we print them on paper, at spacing of 300 pixels per inch hopefully (I say it as 300 dpi), but maybe less if that is all the pixels we have. 2304 pixels / 8 inches = 288 dpi, so this is the capability of it..

So if you print 8x10 inches, 6mp will print at 250 dpi and 8mp will print at 288 dpi. Both are fine, but 288 is a hair better than 250 if the image is really sharp, or if you crop a lot, then the larger image is better (to have something left)..

If you print smaller, like 6x4 inches, then there is no difference, both are larger than you need. 6x4 inch prints at 300 dpi needs 1800x1200 pixels which is 2.1 mp...

Comment #2

The quality is in the composition, colors, lense, and sensor:.

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Tim'Be the change you wish to see in the world.' -Mahatma Gandhihttp://www.flickr.com/photos/timskis6/..

Comment #3

Ericbertrand wrote:.

I am looking at to different Digital SLR cameras, Nikon D40 (thatonly has 6 mega pixels) and a Canon rebel XT ( 8 mega pixels). Willthe different in pixels make a differents in the quality of mypictures?.

Perhaps a little?.

As Tim showed, a good 5 MP camera in capable hands can take great pix. But it depends a LOT on what kind of pix you will be taking and how you will be displaying them..

If you are going to be taking low-light pix, perhaps of entertainers in a dim club, then more pixels is WORSE! If you will be displaying your pix on a computer screen, then 1 MP is enough. If you will be printing on paper larger than 8 x 10, then the difference between 6 and 8 MP is very small but might be important..

Often the LINEAR difference is more telling than the area. As Eric analyzed, the difference in 3008 and 3456 is only 13%. This pretty much represents the differences: 13% worse resolution...13% better noise..

Charlie DavisNikon 5700 & Sony R1HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/..

Comment #4

Chuxter wrote:.

If you are going to be taking low-light pix, perhaps of entertainersin a dim club, then more pixels is WORSE!.

I disagree..

Often the LINEAR difference is more telling than the area. As Ericanalyzed, the difference in 3008 and 3456 is only 13%. This prettymuch represents the differences: 13% worse resolution...13% betternoise..

Theoretically 13% better noise if you are looking at 100% pixels, assuming otherwise similar sensors. But those 100% pixels aren't the same size, you've (obviously) got more of them in the 8mp image. Now downsample the 8mp image to 6mp and compare the noise. The 8mp (which is now 6mp) image will, pixel for pixel, be about the same as the 6mp image..

With a higher resolution sensor you get more detail when you can shoot with low ISO, and similar detail and noise performance when you have to shoot with high ISO. That's a win (low ISO) tie (high ISO) situation..

Seen in a fortune cookie:Fear is the darkroom where negatives are developed..

Comment #5

Chuxter wrote:.

As Tim showed, a good 5 MP camera in capable hands can take greatpix. But it depends a LOT on what kind of pix you will be taking andhow you will be displaying them..

Right, but more needs to be said out loud to answer the question about how many megapixels..

I am hoping to comment only on the meaning and purpose and use of megapixels. I do not mean to comment on these pictures as such, and they are great pictures, but they have absolutely nothing to do with 6, 8 or 5 megapixels..

Speaking of megapixels, then the images posted here are 1024x768 pixels in size, which is about 0.8 megapixels. These posted images might print possibly 5x3 inches now (assuming about 200 dpi as "good enough", 300 dpi would print better, but smaller, only about wallet size). This may possibly satisfy some goal, or it may not. Any larger goal requires more pixels. I feel sure larger images do exist somewhere, but they were not posted here, and our video screens are not large enough to show them if they were. A 1 megapixel camera creates this 1024x78 pixel image size too, and we are looking at 0.8 megapixel images.



Image quality may be about camera quality, sensor quality, lens quality, photographer quality, even subject quality, but it is not about pixel count. Only the display is concerned about pixel count. Image size (pixels) can determine how the image might be used, because we do need enough pixels for any display goal, and if insufficient for the display, then image quality can suffer that way too..

The only idea is to have enough pixels for our display goal, like was said..

If the goal is a 1024x768 pixel image to show on a video screen, then this is about 0.8 megapixels. This is all the pixels that will fit this format, 1024x768 = 786,432 pixels. More will not help. If we have more, we must resample and discard them..

If the goal is to print 6x4 inches at 300 dpi, then this needs 1800x1200 pixels, about 2.2 megapixels. This is all the pixels that will fit this format..

If the goal is to print 8x10 inches at 300 dpi, then this needs 2400x3000 pixels, or about 7.2 megapixels. This is all the pixels that will fit this format..

More pixels will not help these goals, with the exception that more pixels will allow us to crop size smaller, and discard some artistically, and still have enough left...

Comment #6

You guy's can discuss and argue dots per inch, etc. all you want but the answer to the op's original question is still; no, you won't be able to tell the difference between 6 & 8 MP. Especially with a DSLR..

As a matter of fact, you wouldn't be able to tell the difference between 6 & 10 MP unless you printed at sizes above 8x10 (A4) or used a magnifying glass (loop)...

Comment #7

As I said in a couple of posts, I have a nikon d200 and a nikon d2hs, and I found the d2hs to produce better quality pictures, even tough it is not the same kind of sensor (JFET LBCAST VS. CCD) but the 6megapixel different doesnt really appeal that a big of difference. the quality stands on the lenses and composition..

All in all no the difference doesnt matter at all, for me that is.unfortunately the world just doesnt fit properly in the sensor of a 35mm camera..

Comment #8

Prints at A4 or above, and shooting with good quality lenses ( primes or pro-lens ) you might see a difference, but it would be small. You would only see it if you could shoot that well in the first place, which is tricky..

The facts are that when people look at an image their brains can actually fill in detail that is often not there. Most prints, even large ones, never really get examined in the kind of detail you see in pixel-peeping. If you think about USM sharpening this is quite artificial and nothing to do with real detail in an image. It is important to fool the brain into seeing what we want - perception over reality..

There is a slight advantage in terms of cropping, but in fact 8Mp is only 15 percent in terms of vertical and horizontal resolution. The jump from 6 to 10 is more significant for cropping..

Someone suggested more pixels is worse. For DSLRs this is nonsense, at least at current pixel densities. For compacts this is relevant as at 10Mp+ a small sensor is hitting physical limits..

StephenG.

Pentax K100DFuji S5200Fuji E900PCLinuxOS..

Comment #9

Nickleback wrote:.

Chuxter wrote:.

If you are going to be taking low-light pix, perhaps of entertainersin a dim club, then more pixels is WORSE!.

I disagree..

Yes, we do. I should clarify that OBVIOUSLY my above statement is true as long as the sensor technology is the same. Hard to compare old sensor with new sensors. hard to compare CMOS sensor with CCD sensors. Really hard to compare Canon CMOS sensors with Sony CCD sensors in this way..

Often the LINEAR difference is more telling than the area. As Ericanalyzed, the difference in 3008 and 3456 is only 13%. This prettymuch represents the differences: 13% worse resolution...13% betternoise..

Theoretically 13% better noise if you are looking at 100% pixels,assuming otherwise similar sensors. But those 100% pixels aren't thesame size, you've (obviously) got more of them in the 8mp image..

I think you got confused there. It's the smaller sensors in the 8MP sensor that cause the 13% extra noise..

Now downsample the 8mp image to 6mp and compare the noise..

Many people, including me, have tried that and they never report that downsampling does much to reduce the noise..

The 8mp (which is now 6mp) image will, pixel for pixel, be about the same asthe 6mp image..

I agree that it seems that it should work, but in practice it doesn't..

With a higher resolution sensor you get more detail when you canshoot with low ISO, and similar detail and noise performance when youhave to shoot with high ISO. That's a win (low ISO) tie (high ISO)situation..

Often the camera with the higher MP also has stronger NR. Canon, for example, has something secret going on at the photosites on the sensor (no firmware) that reduces noise, but also blurs images a bit. I'm one of those people that will accept noise to get detail. I can manage a little bit of noise, which I kinda like..

Charlie DavisNikon 5700 & Sony R1HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/..

Comment #10

Sjgcit wrote:.

Someone suggested more pixels is worse. For DSLRs this is nonsense,at least at current pixel densities. For compacts this is relevantas at 10Mp+ a small sensor is hitting physical limits..

I made that statement. It wasn't nonsense! Let me state it again: Given that everything else is the same, a smaller photosite will always create more noise. If you judge that low-light noise performance is important to you, then you should look for a camera with a relatively low number of pixels. These rules are not just for compact cameras..

Charlie DavisNikon 5700 & Sony R1HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/..

Comment #11

Sjgcit wrote:.

You would only see it if you could shoot that well in the first place, which is tricky..

If only we could shoot that well in the first place. I've been trying for 50 years, and I still don't shoot that well. I probably only deserve 1 megapixel.Leonard Migliore..

Comment #12

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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