I was asked by support to post this in the bug forum. I'm posting the text from the support topic to give a bit of information and background. The gist of the issue is that after the January 23rd update, my in-game display was very dark. I normally adjust the gamma to account for this, but the gamma adjustment wasn't working at all. After some troubleshooting and trying suggestions from people in the help channel, I took a stab in the dark and unhooked my 2nd monitor. Once I did this, I was able to adjust the gamma and brighten the game. I tried hooking up my 2nd monitor and it presented the same issue - a dark game with no ability to adjust it. I'm looking for a possible solution that will allow me to adjust the gamma and still have my 2nd monitor in use.

Windows: Since the last update, the game is very dark. I used to adjust the in game brightness by using the gamma setting in Menu Options Graphics and Audio, but this setting doesn't seem to have any effect at all now.

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I've been able to fix my brightness issues I was having by using windows color management, and then re-calibrating my monitor. I am unsure "bug" was due to upgrading to the latest build of windows 10 (1909), or if it was from upgrading CoH.

Yes, but my previous config was application controlled. Also when I did my 1909 upgrade, it felt darker. So I just did calibration in windows. Though, shouldn't have lost gamma correction in game. I chose to leave it application controlled. In case there is a bug with CoH, that will effect gamma slider for dual monitor.

I'm hoping it will be functional again, but until then I've managed to fix my brightness issues in windows, and in game by using windows color management. I am unaware if I had a profile there b4 I did my upgrade, so I very well could of been my upgrade. I dunno.

Gamma Panel lets you adjust brightness, contrast and gamma settings for your monitor in real-time. You can also save various settings to different profiles, and apply these profiles by using user-defined global hotkeys.

This software has BUGS.

Try to set the value of 3 sliders to zero oneby one.

First set the gamma than brigthness and than contrast to zero.

Than RESET.

Than set brigthness, contrast than gamma to zero.

There is a noticable difference between first and second setting.

I use to work at night and it is eye-hurting to watch at lightbulb-bright screens (I've got two - laptop's built-in panel and an external 18-inch CRT) in a dark environment. So I adjust my screens to be darker.

1.0 is the normal (uncorrected) gamma value. Setting a lower gamma (for example 0.7) will increase the contrast of bright luminances, which makes midtones darker and decreases white washing. Setting a higher gamma (for example 1.5) will make midtones brighter and increase the contrast of dark luminances, but also increases white washing.

For my inexpensive laptop, I use gamma 0.8 to compensate for the too bright factory setting for the LCD and I find that the gamma correction helps with color reproduction too, which is nice because so far I haven't managed to get any color calibration working on this LCD.

First and most importantly, if at all possible adjust the display backlight, rather than using software correction of pixel values. If you dim the backlight you still get full or near-full dynamic range, giving you a clearer, "deeper" image that tends to be more readable.

Software adjustment can't make the blacks darker, it just makes white greyer and reduces contrast. So instead of using pixel values from 0-255 it might use from 0-180 for example. Everything looks flatter.

Last I checked, most displays unfortunately do(did?) not implement backlight control from software. There's a standard for it, DDC/CI but adoption has been limited. Try the ddccontrol tool with your monitor and see if you have any luck.

I've only seen it in very high end displays intended for calibrated photo and video work ... and even many of those use a USB connection and custom USB HID based driver instead of the DDC/CI standard. I'm pretty outdated though, and the linked article claims that basic options like brightness and contrast are widely supported now.

Some cheap displays don't support backlight control at all. The brightness controls on the display just adjust the pixel values on the LCD, just like software control does. Do not use these controls if you have such a monitor; it's usually better to do the correction in software, certainly no worse.

All too many displays do have backlight control, but minimum brightness is still eye-searing. They can sometimes be modified, but otherwise your best bet is setting them to minimum backlight brightness and then living with changing pixel values to get them even dimmer.

It really annoys me that displays have such a limited backlight intensity range, often artifically and arbitrarily limited, starting at eye-searing to "the power of a million suns". I look for dim backlights when I'm speccing out displays to buy.

The details are somewhat driver and software specific, but your laptop should offer convenient Fn keys that make it easy, and the OS should have a simple display brightness slider. The xbacklight utility offers a convenient command line control for this, though on my system it doesn't seem to like to go below 1% brightness and goes straight to black.

I twiddle the driver controls because my T460 is very bright - wonderful during the day, but horrible at night. The minimum brightness step offered by the fn key adjustments is still way too bright, but the driver provides much finer grained control. xbacklight only lets me get down to brighness 8/255 and I'd like So I tell it to run at 4/255 brightness:

When you lower brightness you might want to increase contrast in software a bit, especially if working on text. It'll cost you image quality, but gain you readability at low brightness. The xgamma utility will let you do that, e.g.

Will set gamma to the default value (1 for each color channel). Select the appropriate output by choosing from one of the connected devices, listed with just xrandr (or xrandr | grep -vE "^ " | grep -v disconnect).

--gamma red:green:blue Set the specified floating-point values as gamma correction on the crtc currently attached to this output. Note that you cannot get two different values for cloned outputs (i.e.: which share the same crtc) and that switching an output to another crtc doesn't change the crtc gamma corrections at all.

--brightness brightness Multiply the gamma values on the crtc currently attached to the output to specified floating value. Useful for overly bright or overly dim outputs.

Note: his is a software only modification, if your hardware has support to actually change the brightness see this answer.

The title of your question suggests you are looking for a generic tool to adjust brightness/contrast and gamma of your desktop. The body of your question suggests you are looking for automatic adjustment matching the time of day. I was looking for an answer to the first variant and found only xcalib, a command-line utility. Thus I have written a gui front-end for xcalib, which can be found on

For the science fiction setting I am working on, I was originally intending for spaceships of a specific faction to have solar panel arrays on their larger ships. Originally, it was more as a stylistic choice to fix up some empty spaces. Some time between designing those ships and the present, I decided I wanted that faction to have exclusive access to efficient antimatter production (where the rest of humanity use fusion reactors and vent off the plasma for thrust and certain weapons.)

I got to thinking on how these solar panel arrays would be useful and decided they would be a backup power source for the electromagnetic confinement systems they store their antimatter in so that the antimattter escape if the main reactor fails.

In my research, I discovered that the energy from matter-antimatter annihilation comes in the form of gamma rays which lead me down a different line of thought. Instead of just using the gamma rays to heat water to run a steam turbine like modern nuclear fission power plants, what if the faction in question had technology that could directly absorb gamma rays and convert that energy into usable electricity? That brought me back to the solar panel arrays, wondering if such tech could be applied to them as well.

If a passive power collection system that was both functionally and visibly similar to a solar panel could absorb gamma radiation and other short wavelength radiation in space, how much could it potentially collect before hitting any thermodynamic limits?

Is there even enough energy to be found short wavelength radiation in space to justify trying to collect it as a power source? Or would it be better to leave those as dedicated solar panels and leave the short wavelength radiation-electricity conversion tech in the antimatter reactor?

It's not really a significant energy source. If you measure wattage carried by photons that pass through a particular volume of space, gamma rays are not very significant. Visible and infrared light are the wavelength where you find the most wattage. That ratio is basically the same whether you're close to a sun or not. In deep space, far from any sun, you'll get very little energy from any form of light.

One of the problems with gamma rays is that they go through everything. Gama rays don't interact with things very often, which means they will likely go through solar panels without being absorbed. If these fictional gamma panels are effective at absorbing gamma rays, then they may be more valuable as shielding than as power collection.

Real world gamma ray shielding involves massive blocks of lead, concrete, water, or whatever. The only way to block gamma rays is to put enough stuff in front of it that it gets absorbed eventually. If you had a lighter, thinner mechanism to block gamma rays that might be a big deal. Especially if your ships frequent high radiation environments or if their enemies utilize gamma-ray lasers. 152ee80cbc

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