More megapixels, better photos: Fact or fiction?

Started Feb 7, 2008 | Discussions thread
Chato
Chato Forum Pro • Posts: 46,792
Re: Well Chato ... here is a good comparison...

Jay Turberville wrote:

Hey, why argue with me? Play my game yourself -

Now let's play my game. In my game I take basically the same picture
at nearly the same time with three different cameras. In this case,
a Coolpix 5000 with a 5Mp 2/3" sensor, a Coolpix 8400 with an 8Mp
2/3" sensor and an E-330 with a 7.5Mp 4/3" sensor. I used
approximately f/4 on the two 2/3" cameras. The E-330 image was shot
at f/8. All were shot at the camera's lowest ISO - hence the highest
quality. That's ISO 50 for the CP8400 and ISO 100 for the other two.
All images were shot with raw, developed in dcraw as 48 bit
non-gammma adjusted TIFFs and color adjusted in Photoshop 7. No
noise reduction was applied at any step. Sharpening was done to the
luminance channel in Lab color space and 48 bit color depth. The 5Mp
and 7.5Mp images were uprezzed to 8Mp.

I'm only posting two images. One is a small picture of the full
scene. The other shows an image crop at 100% pixels. I'll provide
links to other crops as well as links to full rez final copies. But
this way, this page won't take forever to load.

BTW, I could have pulled more detail out of the CP5000 image by
sharpening a bit more, but that would have further increased the
noise and exaggerated some of the aliasing

The summary here is that the CP5000 has less detail and more noise
than the CP8400 - the camera with smaller pixels. The E-330 has the
least amount of noise, but also is a bit less sharp. A better lens
might help the E-330 a bit or it might just be that the E-330 has a
more agressive AA filter. I don't know.

But anyway, this demonstrates my point - and the camera makers' point
rather well. Increasing pixel count on the same sized sensor can
improve overall image quality. In this case, it improves resolution
and noise - though it probably gives up a little on the DR front. Of
course, improvement may not always be the case. Another comparison
with different cameras might give a different result. The lesson
here is that you can't just assume. You need to actually do some
checking.

Now, from the standpoint of making an 8x10 or 11x14 print, all of
these cameras can give very nice output. The practical differences
really aren't that large. But overall image quality improved with
the CP8400 and its smaller pixels. It didn't get worse. In good
light, I don't hesitate to use the CP8400 if the situation warrants
it. Its images don't look plastic (take a look at the 4 comparison
images) and though it has a tad more noise than my DSLRs, it isn't
enough to hardly ever matter.

The image order is:

Coolpix 5000................Coolpix 8400 ....................E-330

These are around 450kb.
http://www.jayandwanda.com/dpreview/E-330_v_CP8400/CP5K_v_CP8400_v_E-330_3.jpg
http://www.jayandwanda.com/dpreview/E-330_v_CP8400/CP5K_v_CP8400_v_E-330_4.jpg

These files are 6-7Mb and my server runs off of my DSL connection.
So don't expect fast uploads.

http://www.jayandwanda.com/dpreview/E-330_v_CP8400/TT103877_Mod_.jpg
http://www.jayandwanda.com/dpreview/E-330_v_CP8400/dscn1420_Mod.jpg
http://www.jayandwanda.com/dpreview/E-330_v_CP8400/dscn1887_Mod.jpg

http://www.jayandwanda.com/dpreview/E-330_v_CP8400/TT103877_Mod_.jpg

I'll check out your site this weekend - But which of the three above "prints" better?

Dave

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