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Help with taking pics of a Plasma tv (1 image)
I've been attempting to take some photos of my plasma tv running the hd-dvd version of Planet Earth for use in a Home Theater forum but I can't seem to get them to come out worth a darn..

Could someone give me some pointers on the best way to take these pics?.

I have my D50 w/18-200vr on the tripod - I'm using my remote shutter release and running in manual mode - I've tried aperture settings in the 5.6 range and adjust the shutter speed until my exposure meter is close to center. I've tried various ISO and WB settings - but the shots continue to come out funky looking (obviously the TV doesn't look like these pics while watching it - in fact it's got a fabulous picture)..

Here's one of the offending pictures:.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

~Billhttp://btz.smugmug.com/..

Comments (12)

BillKen wrote:.

I've been attempting to take some photos of my plasma tv running thehd-dvd version of Planet Earth for use in a Home Theater forum but Ican't seem to get them to come out worth a darn..

Have you ever noticed how EVERY SINGLE IMAGE in advertisements about image-producing gadgets, from televisions to cameras to printers to PDAs (and even some digital wristwatches) includes the fine print phrase, "simulated picture"?.

Your brain processes images; the camera records them. A picture OF a picture tends to look wrong. Ads give you the "feeling" of using the product by compositing the generated image from a different source entirely and carefully color-treating the result to make it seem convincing..

If you must capture a real scene, for Amazing Randi purposes, then you will need a relatively slow shutter and carefully balanced exposure between room lighting and the television light output, and be careful about the whitebalance of the camera AND the natural white point for the television..

[ e d @ h a l l e yc c ] http://www.halley.cc/pix/..

Comment #1

It wouldn't hurt to take the picture at right angles to the screen ";^)A member of the rabble in good standing..

Comment #2

(A followup, since I couldn't actually view the offending sample image previously.).

The strongest problem in the image is referred as "moire," a pattern created when you're sampling colors at one resolution and alignment in the camera, which are produced at a different resolution and alignment in the scene. The only real ways to avoid this are (1) to shoot very unfocused, or (2) to sample less than half of the resolution of the original image. Neither one are something you're likely to accept..

[ e d @ h a l l e yc c ] http://www.halley.cc/pix/..

Comment #3

I've never done this... but I would think (first off, you are pausing the DVD correct? The HD DVD should still look very clear paused) that you would want a slow shutter speed so that you're not freezing the scan lines on the TV..

I would start there, to make sure I don't freeze any lines, and then work the other settings around it to get the right exposure..

I hope you get it to work, and please let us know what you did to make it work..

Albert-OColoradoPlease visit me athttp://www.berto.zenfolio.com.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window..

Comment #4

I would pause the DVD, so the screen holds still, then I would try to take a picture with a shutter speed of about 1/15 second..

I could be way off base, but I think that would be a start for eliminating artifacts from the shutter speed being less than the update rate of the screen...

Comment #5

Thanks for the replies - unfortunately nothing seems to be working..

It seems like some kind of Moire pattern I can't get rid of due to some sort of interaction between the pixel pattern on the TV panel with the pixel pattern on the camera chip in my D50.~Billhttp://btz.smugmug.com/..

Comment #6

BillKen wrote:.

It seems like some kind of Moire pattern I can't get rid of due tosome sort of interaction between the pixel pattern on the TV panelwith the pixel pattern on the camera chip in my D50..

If that's the case, you could try using manual focus, and deliberately adjusting the focus so it is slightly blurred. That should help remove the effect of the pixels on the screen.Regards,Peter..

Comment #7

Just a thought, but I wonder if a polarizer would help?.

Leehttp://leem.smugmug.com..

Comment #8

Thank you both for the suggestions - I will try the manual focus method - but it sort of defeats the purpose of taking the pics to show how nice the picture is on the plasma. I suppose I could sharpen them back up in pp..

I have a Hoya UV filter on it now (mostly for protection) and have tried it with it off as well - same results though. :~Billhttp://btz.smugmug.com/..

Comment #9

UV filter Polarizing filter.

And you should have a little more faith in your manual focusing skills. Leehttp://leem.smugmug.com..

Comment #10

Zoom in as close as possible and get sections of the screen..

Then combine them using some stitching software..

Then reduce the size of the picture, and hope the down-sampling removes any artifacts...

Comment #11

BillKen wrote:.

Thank you both for the suggestions - I will try the manual focusmethod - but it sort of defeats the purpose of taking the pics toshow how nice the picture is on the plasma. I suppose I couldsharpen them back up in pp..

Sharpening afterwards might help..

Just a thought. This is one of the few occasions where film has a definite advantage over digital. The random grain structure in film will not cause moire effects.Regards,Peter..

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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