I´m satisfied with everything, but there is an isse wht the image on the lieft side of the screen when looking at HDMI-input (Apple TV) The Keystone seems wrong and the border is not vertical. The right side is fine and if I switch input source to internal the screen is perfect. The ATV is updated and not defective, works fine with other screens
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@Andreas_Bjurling it’s a known issue and on our task list to solve! But maybe you’d like to attach some pictures to explain more clearly, since this issue only happens for internal android, not HDMI sources.
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I´ll see if I can get some pictures for you. But it is the opposite for me. Internal UI works perfectly, when I switch to HDMI, the left side is not vertical anymore. It did not change after software update, but remained the same
External sources (HDMI/type-c) only supports vertical keystone correction. Have you tried turning that off and see?
My initial impression is that maybe the internal is actually wrong so it’s not right when in HDMI so you might need to reposition your projector physically.
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Just for reference that this Topic is listed as Task #29 according to:
An engineer has been assigned to this issue and it is in progress.
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Just checking in to see if any progress has been made on bug #29 (linear distortion issue).
Thank you!
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Is the h linearity issue still actually being looked into? I would like to be able to actually use as advertised…(See image attached)
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Do you mean with internal content (ie. apps running on the projector itself) or external content (HDMI / USB-C)? With internal content, it should already work. If it doesn’t for you, there should be help available with that here on the forum. With external sources, it’s unfortunately never going to work because the hardware doesn’t support it. The 4 corner adjustment is part of the projector’s Android OS, and the external sources bypass that completely. See this thread for more info: INFO: Limitations of features for HDMI and USB-C inputs
Edit: sorry, just realised that you probably asked very specifically about the linearity issue and not about 4 corner correction in general.
The last issue mentioned is not relevant to this topic. Please move to a relevant thread. (See it is now merged elsewhere, thank you!)
Really hoping the work on Linearity Distortion is coming along!
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To debug/setup 4 corner (and maybe other correction) better, can we get a grid of squares texture similar to UV mapping textures but 16:9? Providing one and allowing the user to select their own would be fantastic.
This will give you orientation and stretching/compression of areas.
example, a 1080p version of:
or
This may be even better:
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@izaaner thanks for the suggestions, we will try to implement it.
Interestingly, the 2nd-last pattern you’ve suggested is the Philips PM5644 test pattern. It is one of the test patterns included with the beta-only color adjustment app.
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I’ve only ever used it with internal content, and I can tell you it doesn’t automatically project from any angle.
Mine was perfectly square on the startup screen but when I try and play something through a firestick its badly distorted.
The design intent is that the projector should adjust automatically when it is angled up or down. The automatic procedure is only designed to handle projecting against a vertical wall or flat ceiling, and must first be calibrated against gravity in a neutral position to know what “down” is. An internal sensor can then sense the angular difference between what was calibrated, and the current direction of gravity.
The projector lacks sensor capability to determine its own horizontal angle against the screen (left to right). From the projector’s own point of view, the picture covers the same angle even if part of the screen it is projected on is closer or further back.
I think it could be theoretically possible to program an appromixation of a “left-to-right” sensor by checking the difference in focus distance while adjusting to find focus, as the left and right side of the screen become sharp at different times. It would not be easy though, if the motorized focus is as imprecise as has been suggested, and the difference in distance is small enough that most of the screen looks “acceptably sharp”. It would probably yield a much less useful result than manual four-corner correction.
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