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Old Aug 3, 2006, 7:20 PM   #1
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I know I discussed this a long time ago, but I've been doing some thinking. I've noticed a small square grid pattern integrated into some of my photos. It only seems to occur mostly on repetitive nature backgrounds, like grass or leaves of trees, bushes, or a pile of rocks. It won't appear in all the photo, only in some sections of those backgrounds and it's not easily noticed. And it is integrated into the background, it uses the same colors and pattern of what's there, except that it creates this grid-like appearance amongst the grass or whatever.

So, I thought I'd try taking the same shot in both a 3 megapixel version and a 6 megapixel interpolated version. I tried a grass shot of both and a tree shot of both. Well, sure enough the grid appeared in the 6M shots, but it was barely noticeable (if it even existed at all) in the 3M shots. Does that indicate that the interpolation process emphasizes the appearance of the grid (which might be pixel or sensor sections or whatever; I'm not technology savvy, sorry!)?

Do you guys notice this or can you explain this? And do you usually use the sensor max. (3M) or the interpolation max. for your photos? Is the interpolated better-looking in any sense?
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Old Aug 3, 2006, 7:45 PM   #2
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Interpolation pixelswill never look as good as real pixels.The pictures on my Mustek 9300 are good at 3MP (sensor maximum), fair at 6MP, and awful at 9MP.

I try to use the sensor maximum, or less, on all my cameras and also to stay away from digitalzoom (another form ofinterpolation).
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Old Aug 3, 2006, 8:11 PM   #3
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Interpolation is con. You can do this in software on a PC anyway. It's basically a way for manufacturers to artificially inflate their cameras specification to look more impressive against the competition without any extra cost. Take Musteks DV 12M and my Aiprek PVR (Also known as the 8800). They both have a 5MP sensor yet mine has an interpolated mode of 8MP while the Mustek has a whopping 12M!!! While I don't use the interpolated modes, the Aipteks 8MP is reasonable compared to the Mustek.

Interpolation basically allows you to print a larger image without it looking pixelated or blocky as it would if you simply enlarged it. The problem is, the amount of detail stays the same because you cannot magically obtain information that we never there in the first place.

It is always best to use the native sensor resolution for archiving and then interpolate as you need it in software.
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Old Aug 4, 2006, 12:07 AM   #4
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Thanks for the advice. Do you guys know if those squares are caused or accentuated from the interpolation or what exactly they are? Have you seen them before?
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Old Aug 4, 2006, 1:49 AM   #5
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This will sound odd, but I never see these blocks in still shots. At the same time, they're practically always present in videos. Foliage such as trees and grass are the most likely subject matter to have them.

I think it's an artifact of the mpeg4 compression. Foliage is a problem because it's full of detail, so the camera can't deal with it and stay within the throughput capacity. Same with panning, when the whole scene is changing. The camera can't process fast enough, so it compresses more. If you let the camera sit on a tripod while filming, you can see in the output that the camera works away at mapping all of the sensor to the best quality - because it has so little work to do in a static shot.

To answer the question, I have no idea why these blocks would be present in stills.
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Old Aug 4, 2006, 3:00 AM   #6
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Post a Pic you got us Concerned

1 hitogram a shot

2. pixalation green ovre green

3 try varioussituations a bridge or a building?

4 are yuo Zooming? are you aiming into or away from the sun

I'll test out mine and wil not see this because Sorry i live in the land of cement Lol:G

Just kidding

I believe you are getting pixaltion and seeing ht interpolatioon at its best and no defect at all.

best thing to do is test all coloredshots and try different angles
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Old Aug 4, 2006, 2:30 PM   #7
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I took more sample shots and have been trying to upload them to show you guys but everytime I place them at the upload site (pbase.com), the grid pattern disappears! I can't show them to you know matter what size I try! I also realized that it is true, the grids only show up in the 6M interpolated shots, and not in the regular 3M shots. And I use Windows picture and fax viewer to see the photos. As it sizes them to look at them, you notice the grid in the 6M shots, but as soon as you enlarge the photo to original size, the grid disappears!

I'm beginning to believe that the grid pattern is simply interpolation "sections" that disappear as soon as you go to the true size of the photo. Needless to say, I'll be taking 3M photos from now on because I'm still unsure of whether the grid is actually part of the photo itself or if it is just there in viewing modes.

If you guys want to check it out, go take a photo with 6M on a bunch of grass or amidst tree leaves and view it with Windows. It's not all in my head! LOL :?
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Old Aug 4, 2006, 2:38 PM   #8
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Have you tried different photo viewing programs? While I am sure it is a legitimate artifact of the photo, the viewers themselves may be exaggerating it too. If you haven't already, download this excellent freeware photo app from www.irfanview.com and see if you can still see the same effect.

If it still appears, maybe you could 'snapshot' your desktop with the sized photo showing this with Ctrl PrtScn and cutout upload a cutout section where the photo is to pbase.com.
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Old Aug 4, 2006, 4:14 PM   #9
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<a href="http://putfile.com/pic.php?pic=main/....jpg&s=f10" target="_blank"><img src="http://f10.putfile.com/thumb/8/21517135211.jpg" alt="Click to enlarge."></a>

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Old Aug 4, 2006, 9:07 PM   #10
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Maybe you've got some sort of incompatibility/mismatch between your monitor and its setting, and the resolution of the stills.
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