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#496
02-05-2021, 01:22 PM
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Here is the Tiff RGB16 with P3. 56 MB! https://visions4netjournal.com/wp-co...45906B6F9.tiff
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#497
02-05-2021, 02:22 PM
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Success at last!
The last 4 pix are recognized by Photoshop as the specified data type / color space. Is the TIFF RGB 16 before any editing? Photoshop recognizes the embedded profile properly as Display P3. I click "use the embedded profile" so that Photoshop doesn't use my default profile, Adobe RGB. It looks less saturated than many previous jpgs you posted. Photoshop properly makes adjustment when I move the image from my wide gamut monitor to my sRGB monitor, to make it look the same on both, so that is another indication that it is being handled correctly. If this version is before editing, you can proceed with editing and then export as Display P3 to maintain both the wide gamut and the look you want. Last edited by old_tv_nut; 02-05-2021 at 02:30 PM.
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#498
02-05-2021, 02:24 PM
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By the way, now that it's working, I would really like to see the door to the Emerald City, with all those green colors.
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#499
02-05-2021, 02:52 PM
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Yea! Good. I did a quick edit on the TIF RGB16.
When I first started shooting with TIFF last week, the tendency was to over saturate. I’m learning as I go and find only small adjustments are required primary with luminosity, shadow and highlights. I’m seeing increased detail and much improved shadow and highlight details. It’s been fun. I’ll post the door shot. Thanks for your help.
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#500
02-12-2021, 03:40 PM
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Does the 15GP22 reproduce extended green and red colors?
17 months ago, the H840CK15 with 15GP22 completed restoration. It was recapped, cleaned, aligned, grey scaled and color calibrated. The emissions read good on three cathodes. Since that time we only made minor adjustments with the user controls and maybe 100 hours of viewing time. We want to know if we can see extended colors on this set and 2 weeks ago, began shooting screenshot photos in TIFF as opposed to JPEG. Because my Sony A6300 won’t transfer tiff files to my iPad Pro 2 with P3 display so far, we used an iPhone X with software added which allows tiff photography. I’m just an amateur photographer and just beginning to understand photo editing. Much still to learn. Hardly a scientific, controlled experiment, we submit these 6 photos for evaluation. They were processed in Lightroom for iPad. Lightroom used the camera profile with no Adobe enhancements. We only have the iPad, iPhone and OLED television all with WCG P3 displays to display our images. I can’t see what the images look like on an RGB display for comparison, so would appreciate any input. These 6 photos were processed in tiff 16 bit, ProPhoto RGB. As a result the files are large between 35 and 55 MB’s. https://visions4netjournal.com/wp-co...A06CEEA6A.tiff https://visions4netjournal.com/wp-co...B285C2546.tiff https://visions4netjournal.com/wp-co...133C2B3C3.tiff https://visions4netjournal.com/wp-co...4674C833A.tiff https://visions4netjournal.com/wp-co...963ACA324.tiff https://visions4netjournal.com/wp-co...A4ABFA3F3.tiff
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Last edited by etype2; 02-12-2021 at 03:43 PM.
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#501
02-12-2021, 05:20 PM
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These look just as you would expect.
Viewed on an sRGB monitor with a non-color-managed viewer (irfanview), they are dull and desaturated. Viewed on a wide-gamut monitor with the same non-color-managed software, saturation looks normal. Viewed simultaneously on an sRGB monitor and a wide-gamut monitor side by side ( by using a copy of the original TIFF) in color managed software (Photoshop) the colors generally look normally saturated in both cases, with the facial and hair tones matching. For the doorman shot, the green of his epaulets, gloves, etc., is slightly yellower and desaturated on the sRGB monitor. The blue-green of his coat is slightly desaturated on the sRGB monitor. This is an indication that these two colors are outside the sRGB gamut as captured by your camera, while the skin and hair tones are inside sRGB. If the doorman and a copy are both viewed on the wide gamut monitor in Photoshop but the copy's color profile is converted to sRGB, you see similar effects to viewing the copy in Photoshop on the sRGB monitor. Summary: it looks like you are succeeding in showing what's on the 15GP22 if the end viewer has a wide-gamut monitor and color managed software. Last edited by old_tv_nut; 02-12-2021 at 05:43 PM.
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#502
02-12-2021, 05:54 PM
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Thank you for that. It’s worthwhile to know there is an observable difference as you described. Now it’s important to have color managed software which I don’t have. I’m thinking that in my situation, it would be better to use “Display P3” color profile.
Next, working on tiff photos from the A6300. These tests inspire me to pursue photography further and getting an Apple Pro laptop. As a side note, LG just added “Air Play” to my OLED which means I can see the photos on a compatible P3 large screen, (EDIT  without the limitations of a Chrome browser for smart TV.
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Last edited by etype2; 02-12-2021 at 06:02 PM.
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#503
02-26-2021, 02:38 PM
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Westinghouse H840CK15 with RCA 15GP22 1953 NTSC extended color gamut phosphors.
Wayne B. here at VideoKarma forum suggested we try rendering photos in TIFF file format to show 1953 NTSC extended color gamut color phosphors. Unlike JPEG, TIFF is an uncompressed format, that captures the full dynamic range of the photo and the photographer adjusts the color and light values. It’s similar to video monitor or television color calibration. Calibration is done to reduce clipping, crushed blacks, adjust grey scale, color balance, luminosity, white balance and gamma. Sorted out the problem we had and needed an SD card reader to transfer TIFF files from our Sony A6300 to iPad Pro 2 with wide color gamut P3 display. We have improved results over the iPhone X and edited the TIFF files with the professional Affinity Photo editor similar to Photoshop. Some of these photos were not edited at all, straight out the camera. I can say that the greens are rendered as I see them on the 15GP22 with the movie, Wizard Of Oz. With JPEG, the greens were muted. The reds are deeper, but I can’t say with authority they are 1953 NTSC correct. Images were photographed with the Sony A6300, rendered in Tiff 16 bit, color space P3 to match the color profile on my iPad, edited where necessary, and converted to JPEG or PNG to reduce the enormous file sizes of TIFF which are over 110 MB’s. Since the files were converted back to Jpeg they should display properly on an sRGB monitor, although you may not see the extended color rendering. If you see distortion or artifacts, I’d like to know. Having fun with this. https://visions4netjournal.com/wp-co...5F5608801.jpeg https://visions4netjournal.com/wp-co...6A2BAF9DD.jpeg https://visions4netjournal.com/wp-co...64E370AEB.jpeg https://visions4netjournal.com/wp-co...99A8E62FD.jpeg https://visions4netjournal.com/wp-co...44622B258.jpeg https://visions4netjournal.com/wp-co...5E6191B89.jpeg https://visions4netjournal.com/wp-co...B4C491C9D.jpeg https://visions4netjournal.com/wp-co...6974121E5.jpeg https://visions4netjournal.com/wp-co...8FC19C3BF.jpeg https://visions4netjournal.com/wp-co...F9B35F6FBD.png https://visions4netjournal.com/wp-co...24342E91B.jpeg https://visions4netjournal.com/wp-co...EA3E362AB.jpeg https://visions4netjournal.com/wp-co...9DC2A28E6.jpeg https://visions4netjournal.com/wp-co...B9EFD0649.jpeg https://visions4netjournal.com/wp-co...FCDAA919D.jpeg https://visions4netjournal.com/wp-co...FDAA1EADE.jpeg https://visions4netjournal.com/wp-co...021D633C3.jpeg https://visions4netjournal.com/wp-co...4127C7B27.jpeg https://visions4netjournal.com/wp-co...4B5F45B4A.jpeg https://visions4netjournal.com/wp-co...AC57457F5.jpeg
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Last edited by etype2; 02-26-2021 at 02:50 PM.
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#504
02-26-2021, 04:49 PM
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May I suggest you reconvert these from TIFF to jpg using a larger minimum file size if you can?
Some of the jpgs are less than 2 MB and some are much larger, and it makes a big difference in resolving the phosphor dots and detail. Eaxmples: 8C3AF40F-EF68-4573-8DDB-EA28FC19C3BF.jpeg. 1.8 MB, dots invisible in many areas, and I suspect details missing too. 3E2D265A-83C8-44F1-B811-79AAC57457F5.jpeg, 6 MB, screen structure and detail visible everywhere.
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#506
02-26-2021, 06:27 PM
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My files were co-mingled. Better file management is in order. :-)
Here are RAW unedited files. Some look to warm such as the hour glass and Dorthy’s face. Some have specks on them from pesky dirt on my camera. Wayne, would you care to edit one of these so we could see a colorist’s expertise? I will resubmit new edited Tiff files shortly. The unedited RAW files. EDIT: DELETED FILES. THEY POSTED AS JPEGS.
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Last edited by etype2; 02-26-2021 at 06:34 PM.
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#507
02-26-2021, 08:09 PM
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oops.
I got an email notice of your post with the links before you deleted them, and started looking at them. I discovered that Chrome was color managing for differences between my monitors, but no idea if it was reading any profiles in the jpg files. So, glad you stopped from going any further.
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#508
02-27-2021, 01:18 PM
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Re-posting files. 7 Jpeg and 3 Tiff. The Tiff files are 115 MB’s.!!
 https://visions4netjournal.com/wp-co...C19D32BC1.tiff https://visions4netjournal.com/wp-co...0139DB8FA.jpeg https://visions4netjournal.com/wp-co...1A99898F2.jpeg https://visions4netjournal.com/wp-co...B43CDD35F.jpeg https://visions4netjournal.com/wp-co...6D73ACDC6.jpeg https://visions4netjournal.com/wp-co...4BF106CC6.tiff https://visions4netjournal.com/wp-co...89C734786.jpeg https://visions4netjournal.com/wp-co...370650453.jpeg https://visions4netjournal.com/wp-co...93C52AF82.jpeg https://visions4netjournal.com/wp-co...B6740534C.tiff
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Last edited by etype2; 02-27-2021 at 02:17 PM.
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#509
02-27-2021, 05:46 PM
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I'm looking at the first TIFF:
https://visions4netjournal.com/wp-co...C19D32BC1.tiff I am puzzled because I can see the phosphor dots plainly in areas with one dominant color, but not in neutral areas. The blue stripes on the dress show prominent dots, but the white stripes and white collar don't. I have a hypothesis of why: The 15GP22 has 195,000 triads and 88.5 square inches of screen giving 2203 triads per square inch or 46.9 triads per linear inch. Screen width is 11.5 inches, giving 539 triads per width. The CRT image does not fill the 6000x4000 pixel image from your camera, but only about 2834x2130 pixels. So, ratio of pixels to triads is 5.24:1. It takes at least 2 pixels to describe a bright phosphor dot and a black space, so this brings the ratio down to 2.6:1. This should still work, and it apparently does. Now note that the red and green dots are spaced twice as close, or 1.3:1, or inverting the ratio, the spatial frequency is 76% of the Nyquist rate. This should still be workable if your camera sensed all three colors in every pixel, but it doesn't. It has a RGB color filter pattern and a spatial low pass filter, and there is antialiasing processing in the raw conversion, to suppress color moire' patterns on such fine details. There may also be effects of in-camera noise reduction if you are shooting at high ISO. The bottom line: if you zoom in to fill the camera frame with the CRT image, you may be able to resolve the phosphor dots everywhere including areas where all three primary colors are lit.
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#510
02-27-2021, 05:51 PM
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Another observation:
In 59BE11FC-3454-4DD6-BDBE-47D89C734786.jpeg you can see dots in the doorman's white buttons, but they are much less prominent in his face.
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