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Be able to disable GAMMA
Posted: Sun Nov 01, 2026 5:00 am
by BipTunia
Since a lot of people will never use Gamma in a capture program, and will want no boost and no cut most / all of the time (set on 1 in SharpCap), and a lot of what you'd do with Gamma in capture would be better done with curves in post (can't easily undo gamma changes that are baked in), ....
.....it would be good to be able to turn it off, so it's on 1, and can't be moved by bumping the slider with mouse (until you put it on manual again).
Easy to way to do this, GUI wise, would be to add it as a third-option into the Gamma Auto On indicator you added. White for manual, can be adjusted, color for Auto on, mono color but diagonal stripes for locked on 1. Or just a number 1 for locked on 1.
Re: Be able to disable GAMMA
Posted: Mon Nov 02, 2026 1:11 pm
by admin
Hi,
what cameras are you using? ZWO removed gamma from their cameras for this very reason a long time ago, but some manufacturers still offer it (sometimes it is only available in RGB mode and not in RAW mode)
cheers,
Robin
Re: Be able to disable GAMMA
Posted: Mon Nov 02, 2026 3:30 pm
by BipTunia
Player One small mono cams for solar and lunar.
Several different ones.
Uranus-M
Uranus-C
(color, for planets)
Apollo-M
Apollo-M Max
Sometimes:
ZWO ASI174MM
Re: Be able to disable GAMMA
Posted: Tue Nov 03, 2026 11:20 am
by admin
Hi,
something a bit odd going on - PlayerOne doesn't even have a way to adjust the gamma in their SDK - SharpCap will never show gamma for a Player One camera that is being controlled via the SDK. ZWO does have gamma in the SDK, but it is legacy - modern versions of the SDK report that it is not available, so SharpCap will similarly not ever show gamma for a ZWO camera being controlled by the SDK.
If you are using QHY cameras you may still see a gamma, as they support it. ToupTek manufactured cameras also show it under some circumstances (not in raw mode I think).
If you have opened the camera via DirectShow (webcam) drivers rather than SharpCap's direct support then you may see gamma adjustments as that is part of the standard set of webcam controls. Using an astronomy camera via the webcam driver is only a last resort fallback - SharpCap will warn you not do do it if you try it (although it is possible to disable the warning).
cheers,
Robin
Re: Be able to disable GAMMA
Posted: Tue Nov 03, 2026 9:49 pm
by BipTunia
admin wrote: Tue Nov 03, 2026 11:20 am
Hi,
something a bit odd going on - PlayerOne doesn't even have a way to adjust the gamma in their SDK - SharpCap will never show gamma for a Player One camera that is being controlled via the SDK. ZWO does have gamma in the SDK, but it is legacy - modern versions of the SDK report that it is not available, so SharpCap will similarly not ever show gamma for a ZWO camera being controlled by the SDK.
If you are using QHY cameras you may still see a gamma, as they support it. ToupTek manufactured cameras also show it under some circumstances (not in raw mode I think).
If you have opened the camera via DirectShow (webcam) drivers rather than SharpCap's direct support then you may see gamma adjustments as that is part of the standard set of webcam controls. Using an astronomy camera via the webcam driver is only a last resort fallback - SharpCap will warn you not do do it if you try it (although it is possible to disable the warning).
cheers,
Robin
On Windows 11, by the way.
It's raining now, I can go out to the AstroHut and check when it stops.
But I did have a QHY camera, I no longer have it, but I installed the software / drivers for it when I had it. They're still on the computer.
Would that make Gamma show up for a Player One cam?
I just tried a Player One cam on my indoors Windows 11 cam on SharpCap latest version, computer that has never had the Zwo or QHY drivers, Gamma did NOT show up in SharpCap.
I also have the drivers for Zwo cameras on that computer, since I plan to eventually move away from ASIAIR. I did bench test a ZWO ZWO ASI2600MC cam on that computer once. And have used that ZWO ASI174MM with SharpCap for Solar Ha.
Re: Be able to disable GAMMA
Posted: Tue Nov 03, 2026 11:15 pm
by BipTunia
OK, I could NOT reproduce it. Tried on two Win 11 computers.
I do not see the Gamma slider when using Player One Apollo Max-M camera, or Player One Player One Uranus-C. I tried RGB and RAW with the color camera.
I do see the Gamma Slider when using either of your virtual cameras built in to SharpCap, Test Cam 1 and Test Cam 2 ( the Deep Space M42, and Jupiter one)
It's possible I saw that and mistook is as being with real cameras, but I don't think so.
I remember when I decided to post this, was while shooting the Moon and using either Apollo-M (not max) or Uranus-M. Posted this the next day.