Saturation control

[Andrey D.]

How does it work?
After debayering image looks bw. I can change it with mouse scroll to 0 or more to negative values. Image becomes color. But that number immediately changes back to 10. And the image returns back to bw after any operation in main window.

Is it intentional behavior?

[han.k]

That slider is for color saturation. Put it in the middle position. At the bottom position there will be no color left. At the top you will likely have too much color.

[Andrey D.]

I understand it. With 10 I have no color and bw picture. With -10 there is a lot of color.
The problem is it always returns itself to 10 and bw.

[han.k]

After setting it to 0=middle, you have to save the settings so it stays at 0 after restart. There several possibilities:

• Press solve button.
• Go to menu File, Settings, Save settings
• Go to menu File, Exit (and save settings)

[Andrey D.]

Got it.
Thanks.

[han.k]

You could try the new development version for Windows. See screenshot

http://www.hnsky.org/astap_setup.exe

[Andrey D.]

Looks nice.
Would be Linux version also available?

[han.k]

Yes here are the links:
http://www.hnsky.org/astap_amd64.deb

or

http://www.hnsky.org/astap_amd64.tar.gz

[Andrey D.]

Checked.
I see two sliders but I can't move them by touchpad on my laptop.
Ubuntu 22.04 Gnome desktop

[han.k]

You have to load an image first before they unlock.

Note thatthe program has been updated on 2025.08.26. If your using an older version please update.

Cheers, Han

[Andrey D.]

Ohh, thank you!
Seems to work now.
The only downside is that I have to click on slider to change the suturation.
If I just scroll the control moves but image stays unchanged.

[han.k]

If I just scroll the control moves but image stays unchanged.

?? If I scroll with the arrow keys, the image changes both in Linux and Windows. The left vertical slider is for saturation and the left vertical slider is for "selective colour saturation". So increase the saturation of faint parts more then bright parts.

[Andrey D.]

Didn't try arrow keys. Just touchpad.
If I scroll with touchpad sliders move but image remains unchanged.
If I left click sliders move and image changes as it should.

Will check again tomorrow.

[Andrey D.]

So
If I move the slider with arrow keys or hold it with left click and move with mouse/touchpad everything works as it should
But when I try to scroll with mouse wheel or touchpad without clicking on it the slider moves, numbers change, but picture remains unchanged. And changes right after any key pressed.

Not critical at all. Looks like events processing logics applying changes on key press/release.

[han.k]

In Windows, mouse scroll does not move these sliders. For Linux, I have added a mousewheel event to the update the image (next ASTAP version). However it will demonstrate a little sluggish response because each mouse wheel step will trigger a redrawn. The current mouse up event triggers only one refresh image.

[Andrey D.]

Not a big issue. I think it could be left as is if processing every wheel step is really slow.