#61
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The clearer photos are photos made with a Canon 7D camera. They have not been through video. The comparison is beween the original and images of the CT100. As I said, the CT100s are adjusted so that when I am looking at the photos of the CT100 on the same Dell monitor, the images on the monitor look exactly like the CT100. Thus, the comparison on YOUR computer is also exactly the same difference between the original and the CT100. I post images of the same Dorothy scene. These are made with the same camera. This is a dvd, not a Blu-ray. It is output as NTSC and modulated on a B-T agile modulator. Both sets look at NTSC true VSB, cut off at 4.2 MHz an -1.25 MHz. The sharp one is my Sony Bravia 45 inch LCD and the other two are the CT100. The camera and processing was set for no sharpening, no noise reduction, no contrast enhancement, and 5250K. The camera was defocused to smear out the dot structure. They were 1/6 second exposures, the f-number was set to compensate for brightness difference. One CT100 image was changed in one way: the color temp slider in Photoshop was moved to 4850K. This makes it look bluer. This is probably a better representation of a by eye comparison; apparently the camera, set for non-auto color temp, is being fooled by phosphor differences. http://www.videokarma.org/attachment...1&d=1428624485 http://www.videokarma.org/attachment...1&d=1428624485 http://www.videokarma.org/attachment...1&d=1428624485 |
#62
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http://www.google.com/url?sa=t&rct=j...90491159,d.b2w
I have some pretty good shots from the oz on this video |
#63
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I think I read somewhere the roundies used a rare Earth element to produce reds in better quality, yittrium, IIRC but they switched over to something else when the rectangular sets came out and the phosphor leaned more towards a red/orange. BTW, I'm in Ohio now, had to move with the death of my mother. I'm close to Wheeling, WV. It's just me and two cats, my 15 year old is running around like a kitten.
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Mom (1938 - 2013) - RIP, I miss you Spunky, (1999 - 2016) - RIP, pretty girl! Rascal, (2007 - 2021) RIP, miss you very much |
#64
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Comments: Image on left looks too blue, looks like 9500 to 11000 K. I see image processing going on in the background. Image in the center looks the most satisfying, well saturated, but slightly warm. Image on the right looks like you added a blue filter. Why did you not set the camera to auto exposure and why did you defocus? I think you would have a truer representation of the images. Yes, the pixel structure would be noticeable on the CRT. Don't we want to see the brightness differences? May I ask the age of the Sony and was it calibrated to Rec.709? Was your CT-100 calibrated? Thank you for posting the images, very nice set and images.
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Personal website dedicated to Vintage Television https://visions4netjournal.com Last edited by etype2; 04-10-2015 at 03:21 AM. |
#65
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__________________
Personal website dedicated to Vintage Television https://visions4netjournal.com |
Audiokarma |
#66
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For the love of god, can someone please compare something that is more modern instead of always using a "Wizard of Oz" for a screen shot? I've seen so many screenshots of that movie, probably every frame of that damn movie.. The wizard of oz was redone in color back in the early days of color TV, so of course you're going to be able to compare roundie verses flatscreen a little easier.. Maybe something from the 2000s that's not cartoonish..
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Looking for an all tube or hybrid color TV set from the late 1960s, early 1970s that's in a steal cabinet.. |
#67
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correct 4850K to 5250K. I probably should have used 6000K. I will redo. Why not auto exposure? Because then the comparison would not be real. This is VERY important ... if you use autoexposure it will automatically change the color temperature setting. Why defocus? This is very important! Its perfectly possible to focus accurately. This means, using my camera, that the camera resolves the individual color dots or rectangles. To get accurate color rendition you then have to set the camera exposure so that the brightest dots do not overload the sensor. This results in a VERY dark image! So if you don't defocus the camera you have do the defocus in Photoshop if you want the whole screen in one image 900 pixels high or less so it can be posted on Videokarma. I have posted pics of my CT-100 showing the dots clearly. The Sony is two years old and is calibrated as best I can to about 6000K, just using a test DVD. The Sony is identically calibrated at least by intent. Getting good pictures of color TVs is not easy! It is very much not a matter of using auto settings on a camera! |
#68
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I liked the blues in the village scenes, they really were vibrant.
also the yellows on the marching soldiers were particularly good, I often have trouble getting those correct. |
#69
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I try and make the room as dark as possible and then fill the image sensor with just the screen of the TV. Then the sensor is reading the light of the TV image only. I use auto settings and don't try and manipulate anything with Photoshop. Excuse me if I say this, but to me if you manipulate a photo, you are changing it up from what the camera sees. I read that you wanted to compensate because the color pixels seem to fool the camera. If you use the same camera, the same dark room levels and use the same auto settings, to me that is the fairest way to create comparison digital screenshots. No manipulation to alter the captures.
__________________
Personal website dedicated to Vintage Television https://visions4netjournal.com |
#70
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Even in the video, the vibrancy shows. You said it was a new CRT.
__________________
Personal website dedicated to Vintage Television https://visions4netjournal.com |
Audiokarma |
#71
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it came with a 21CYP22, but alas one of the filaments was open with that (the operating guns test GREAT argh).
I has a 21FBP22, the kind with the greenish face. I am holding on to the grey face 21CYP22 in hopes of someday getting it rebuilt. |
#72
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be pin sharp and the autoexposure will be correct on average, so that the individual brightest color dots will be very highly overexposed. This totally ruins the color. You absolutely must either defocus or use manual exposure to way way underexpose. |
#73
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I reprocessed the Bravia photo to 6500K in Camera Raw. This
is extremely close to what a camera auto color temperature would have done (Camera Rawhttp: tells you that). //www.videokarma.org/attachment.php?attachmentid=186496&stc=1&d=1428689 351 |
#74
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#75
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Audiokarma |
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