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Custom resolution with blur buster 1350 trick

Adjusting BENQ Blur Reduction and DyAc (Dynamic Acceleration) including Blur Busters Strobe Utility. Supports most BenQ/Zowie Z-Series monitors (XL2411, XL2420, XL2720, XL2735, XL2540, XL2546)

Custom resolution with blur buster 1350 trick

Postby Seene » 26 Jun 2017, 18:42

Hello everybody,

Let me start by introducing you to what I did so it makes communication easier. There is a fantastic guide of bringing BenQ Z series monitors to "glorious levels" where the author of that guide went into detail of how to achieve that and he did that by; applying custom IIC profile, tweaking blur reduction and setting up the 1350 timing trick. I will leave link at the very bottom for reference. It worked well and I was happy with the result.

My question is that, is it possible to do completely the same thing but for custom resolutions, to be specific, for 1440x1080? I tried to set Vertical active pixels to 1350 in the timings section but it doesn't allow me to do that. I managed to create the 1440x1080 custom resolution, but, without the '1350' trick everything is very dark and I was wondering if it is possible to achieve same brigthness as if you were to do it on 1920x1080.

Thank you for any help.

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Re: Custom resolution with blur buster 1350 trick

Postby RealNC » 26 Jun 2017, 19:41

Apply the tweaks you want to 1920x1080, then add 1440x1080 without tweaks, and enable GPU scaling.
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Re: Custom resolution with blur buster 1350 trick

Postby Seene » 27 Jun 2017, 06:59

RealNC wrote:Apply the tweaks you want to 1920x1080, then add 1440x1080 without tweaks, and enable GPU scaling.


Excuse me, but could you please go a bit more into detail? Would appreciate it, if you could write it down step by step.
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Re: Custom resolution with blur buster 1350 trick

Postby RealNC » 27 Jun 2017, 10:07

You said you already got it working for 1920x1080. So when you add 1440x1080, do not modify the timings. Just use the defaults. In the nvidia panel, select GPU scaling instead of display scaling. Then switch to 1440x1080. The monitor OSD should still say 1920x1080 even though you're using 1440x1080.
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Re: Custom resolution with blur buster 1350 trick

Postby Seene » 27 Jun 2017, 12:50

I have already done this, the problem is that whenever I switch to 1440x1080 the screen gets dim, whereas on 1920x1080 the brightness of the screen is fine. So is there a way to make the screen brightness the same as on 1920x1080?

RealNC wrote:You said you already got it working for 1920x1080. So when you add 1440x1080, do not modify the timings. Just use the defaults. In the nvidia panel, select GPU scaling instead of display scaling. Then switch to 1440x1080. The monitor OSD should still say 1920x1080 even though you're using 1440x1080.
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Re: Custom resolution with blur buster 1350 trick

Postby RealNC » 27 Jun 2017, 14:39

Then I'm most probably wrong, and you should ignore what I wrote :mrgreen:

Hopefully someone else can tell what's going on.
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Re: Custom resolution with blur buster 1350 trick

Postby Seene » 27 Jun 2017, 17:25

Its all good, thank you anyways for your time! I'm hoping that somebody will come up with the answers. In meantime I will try to find the solution by myself.

RealNC wrote:Then I'm most probably wrong, and you should ignore what I wrote :mrgreen:

Hopefully someone else can tell what's going on.
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Re: Custom resolution with blur buster 1350 trick

Postby Chief Blur Buster » 28 Jun 2017, 10:31

There is more than one way to use custom resolutions with VT1350, with and without GPU scaling.

Unfortunately it's all very tricky, and may not work on all monitors nor on all cards/drivers.

If you prefer 1:1 pixel mapping and you manage to turn off GPU scaling (and use ToastyX CRU instead of NVIDIA), you may simply subtract from Horizontal Active, and add half of each to Horizontal Front Porch / Horizontal Back Porch. In this case, you get 1440x1080 centered in middle, but preserving 1080p original "Total" timings in both the horizontal and vertical dimensions (HT2080, VT1350).
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Re: Custom resolution with blur buster 1350 trick

Postby Seene » 29 Jun 2017, 15:34

I have no idea what is 1:1 pixel mapping and what it does. What is it and what are benefits and drawbacks of using 1:1? Also I didn't really get the Horizontal calculations, could you elaborate on that please? I'm apologising if these questions seem silly to you.
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Re: Custom resolution with blur buster 1350 trick

Postby Chief Blur Buster » 30 Jun 2017, 13:17

Seene wrote:I have no idea what is 1:1 pixel mapping and what it does. What is it and what are benefits and drawbacks of using 1:1? Also I didn't really get the Horizontal calculations, could you elaborate on that please? I'm apologising if these questions seem silly to you.
Mathematically:

Vertical Total = Vertical Active (vertical resolution) + Vertical Front Porch + Vertical Sync + Vertical Back Porch
Horizontal Total = Horizontal Active (horizontal resolution) + Horizontal Front Porch + Horizontal Sync + Horizontal Back Porch

1:1 means unscaled. Basically 1 pixel resolution for 1 real pixel on the display. (e.g. no stretching of image). GPU scaling disabled, monitor scaling disabled.

One of the (many) techniques to achieve 1:1 mapping with lower resolutions while keeping 1080p timings, is to keep both Horizontal Total and Vertical Total unchanged. This means transferring values from one to the other. e.g. when reducing horizontal resolution, something else needs to increase. Normally 1920x1080 uses a Horizontal Total of 2080. So if you're decreasing horizontal resolution, you want to correspondingly increase both the Front/Back Porch values. For example to convert a working 1920x1080 VT1350 mode, you simply copy that mode, then change "1920" Active to "1440" Active (decrease of 480). Then add 240 each to both Horizontal Front Porch and Horizontal Back Porch (480 total, evenly split between the porches), in order to keep Horizontal Total unchanged. Then you've got 1440x1080 VT1350 while maintaining exact original dotclock. Note, dotclock equals HT times VT times refresh rate -- basically the number of pixels per second (both visible and hidden) transmitted over the video cable. And it's easier to bypass NVIDIA GPU scaling via using ToastyX CRU.

Yes, my instructions are very different. Yes, there are obviously many other ways to do this (including variants of the approach RealNC pointed to), but if your goal is a 4:3 1440x1080 120Hz mode without scaling at all, and with black bars at left/right -- for BenQ/Zowie Blur Reduction with lower strobe crosstalk -- then this is probably what you may prefer to do.

TL;DR: Clone (make a copy) of your already-working 1920x1080 VT1350 mode in ToastyX CRU, then reduce Horizontal Active "1920" by 480 to a "1440". Then in order to maintain Horizontal Total 2080 (HT2080) -- add 240 to Horizontal Front Porch, and add 240 to Horizontal Back Porch. You've thus maintained VT1350 and HT2080.

If you want to learn more via advanced technical explanations:
-- For a better technical understanding what these numbers technologically means, see Custom Resolution Utility Glossary.
-- For a better technical understanding of the causes of strobe crosstalk, see www.blurbusters.com/crosstalk
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