Lg e8 oled screenshot test

[etype2]

Originally Posted by old_tv_nut

OK - I opened the EXIF data on one of the pics and I see a shutter speed of 1/200. It appears this has captured some sort of duty-cycle dithering of the pixels on the display. I would try shooting at 1/30 second or slower and see what happens.

I will try that tomorrow, but can you tell me if you see the same artifacts when you click on the images on my site?

[etype2]

Originally Posted by old_tv_nut

BA44021A-F920-4EFE-9165-CBF1CA78306B specifically is the one I looked at, and yes, it is the same when downloaded from the page link you just gave.

When viewing on the iPad pro, are you enlarging it to original pixel resolution? If not, the viewer app may be smoothing out the artifacts.

As far as the color being correct on the iPad, this only indicates your viewer app is properly color managed; it does not indicate that the full P3 gamut is preserved in the jpg file.

The screen resolution of the iPad is 2224x1668 pixels, but if I pinch it out to full resolution (6000X4000) I see no artifacts.

Okay, I need to study the color management. I can shoot in RAW. Thanks for this, obviously I’m not fully understanding what I’m trying to accomplish.

[etype2]

When enlarged to full resolution on my display, I do see something that looks like pixel structure. I wondered about that, because the pixels should not be visible. The LG E8 has a native 4K resolution and I can’t see the pixels with eyes focused very close to the screen. Is this what your talking about? Honestly not objectionable but clearly visible in full resolution. I’m so used to seeing the images in 2224X1668. Not seeing any other artifact.

[old_tv_nut]

Sorry I can't post a pic now because I have reached my upload limit (asking Tim if it can be increased). I will crop a portion of the image and link it on Flickr tomorrow. The pattern seems larger than individual pixels to me, but I will review - maybe that's what I'm seeing. Do the pixels on the display have a unidirectional placement (like R,G,B from left to right similar to an LCD) or some sort of two dimensional grid?

[etype2]

Posting enlargements to 6000x4000 but limited to iPad screen resolution. It does not look like pixels, more of a grid pattern. The second photo is the very blurred bush’s background with stuff that looks like hash. I chalk that up to unresolved details in a very blurry background. This is digital file supplied by Warner with the BluRay UHD and streamed at about 25 mbps.

https://visions4netjournal.com/wp-co...0AD2A9CED8.png

https://visions4netjournal.com/wp-co...D85DBE92A5.png

[old_tv_nut]

Here's a cropped section to illustrate what I'm seeing. It's small enough to display full size on just about any monitor.

[etype2]

Yes, that comports with the photos in post#35. I don’t have a laptop or desktop. The iPad Pro 2 with 10.5 screen has a pixel density of 264 per inch, P3 gamut, so my photos look good at that resolution.(actually 6000X4000) I’ve checked on the web browser of the LG E8 55 inch OLED and when clicked on to 6000X4000, that grid structure is visible. Further below, the photos taken from Oz in UHD HDR Dolby Vision BluRay source on a 120 inch screen, the grid pattern is not visible. Also when I take SS’s of live broadcasts on the LG E8, I do not see this grid pattern.

Having said that, I’m convinced this artifact is present in the digital copy and not the BluRay disc. Still, I’m seeing freckles on Dorothy’s face not seen before and other details. Brighter deeper colors. I took 14 shots of this same image in freeze frame, took different settings, shutter speeds and I could make the grid pattern go away, but the photos looked less sharp. The best looking, sharpest photos have the grid pattern. I think it’s embedded in the digital file.

Next step is to buy a second BluRay player (my existing BluRay player is deeply embedded in a media cabinet which I don’t want to mess with) to run Oz on the LG E8. I’m going to need a mini USB card reader to iPad port to transfer the very large RAW files to the iPad. Then I can do the processing in Lightroom or Infinity Photo.

EDIT: Same photo full resolution on iPad.


https://visions4netjournal.com/wp-co...1CA78306B.jpeg

[old_tv_nut]

Very interesting!

[etype2]

Update August 24, 2020.

The Apple TV app was finally made available on my 2018 LG E8 OLED which now as over 8,600 hours on it. (No trace of burn in after 18 months.) I wanted to retest to see if the grid pattern discussed in the above posts would still be there. That’s an affirmative, see below 7 screen shots. Then to check if the pattern was unique to The Wizard Of Oz, we took several SS’s of Mama Mia! Here We Go Again, a delightful musical based on ABBA music. Production values and color are excellent. The pattern is there as well, so I conclude we are seeing the pixel pattern on the OLED screen. The pattern is only visible on well focused photos.

Both movies are in native 4K with Dolby Vision HDR and Dolby Atmos object based sound. Both movie were streamed from Apple TV which has an average bit rate of 41 mbps. The shots were taken by a Sony A6300, this time in full auto, with tripod. FL 16 mm, SS 1/160, CWB. The LG E8 was tested having 98% DCI P3 color gamut.

EDIT: No freeze frame used.

https://visions4netjournal.com/wp-co...1E5FBC8BE.jpeg

https://visions4netjournal.com/wp-co...49AFD8E58.jpeg

https://visions4netjournal.com/wp-co...DFF7F9832.jpeg

https://visions4netjournal.com/wp-co...ACA70CFAD.jpeg

https://visions4netjournal.com/wp-co...B58FA1604.jpeg

https://visions4netjournal.com/wp-co...2EE886271.jpeg

https://visions4netjournal.com/wp-co...13AE70503.jpeg

[old_tv_nut]

Can this source be paused to take multiple photos, to see if the pattern is time-dithered, and a long-exposure photo to see if the pattern gets averaged out?
Can you get the same pattern with a different paused source?

[etype2]

Originally Posted by old_tv_nut

Can this source be paused to take multiple photos, to see if the pattern is time-dithered, and a long-exposure photo to see if the pattern gets averaged out?
Can you get the same pattern with a different paused source?

I will try that. Can you explain “time- dithered”?

[old_tv_nut]

I mean that the pattern may change during one frame so each pixel averages to the correct value, and therefore no pattern would be visible to the eye or to a long exposure.

[etype2]

So, 8 photos. 2 sets. All paused. First set, 4 photos from Oz. Second set, 4 photos from Mama Mia.
First 3 photos in each set used same settings as post#39. Forth photo from each set used an exposure of 2 seconds.

The Apple TV app dims the images when paused, so the Oz photos look significantly darker. The darkened paused Mia photos from the modern film is not as apparent.

Pattern shows up in the first 3 photos taken sequentially in both sets. Pattern is gone in forth photo of each set. Spots appear in the 2 second Oz exposure, and no spots in the Mia exposure.

I wonder why the spots on the long exposure? If you watched the documentary about the restoration, they painstakingly removed dirt from the Oz film. Dirt on my camera sensor? The 2 second long exposure shots look blurry.

Edit: With a magnifier, I see no pattern on the OLED screen. So I guess I was wrong about the pattern being the OLED pixels.

https://visions4netjournal.com/wp-co...EC6D04271.jpeg

https://visions4netjournal.com/wp-co...37A9D17A8.jpeg

https://visions4netjournal.com/wp-co...2A24235B3.jpeg

https://visions4netjournal.com/wp-co...B5062F45F.jpeg

https://visions4netjournal.com/wp-co...F44748991.jpeg

https://visions4netjournal.com/wp-co...C44EB5235.jpeg

https://visions4netjournal.com/wp-co...D04B296CA.jpeg

https://visions4netjournal.com/wp-co...C787E8B23.jpeg

[old_tv_nut]

Look at the unbuttoned shirt button, and you see a change in the pattern from shot to shot, so yes, duty cycle modulation (dithering) as suspected.

Regarding the dirt spots - very likely on your sensor, and thrown out of focus when you use short shutter speed and wide aperture. What were the apertures for the short exposures vs. the long exposure?

[etype2]

SS 2 sec., F22
SS1/160., F4.0

That confirms it.