Siril Pixel Math format

Software Siril
1

Hi,
I’m new to Siril, or maybe not, I used Iris maybe 15 years ago. I found Siril very interesting now with its 32-bits format. I have done some processing and now want to go further. I can’t find much iinformation or tutorials about Pixel Math which was added to Siril lately.

I try to do something simple now in the beginning.

(Flat-Bias)/3000, this works as it should.

But when I try to correct the bias with a constant it failure, I think I use the wrong format.

(Flat-Bias-10)/3000, this doesn’t work, give an empty image. What I want is to subract the constant 10 from every pixel.

Any idea what’s wrong, or a link to some page with information about Siril Pixel math ?

The Flat, Bias and Dark I have in 32-bit format, but the image is still in 16-bit, before I do math on the image, how to transform it to 32-bit format ?

/Lars

Homepage:
www.astrofriend.eu

2

Why don’t you use the synthetic bias option: Siril - Synthetic biases ?

PixelMath works in the [0, 1] range, even for 16bits image. So you need to subtract (10/65535).

For single image you can switch the pixel depth selector in the right top of Siril.

Cheers,

3

Thanks,

With 10/65535 I got it to work. But the 16-bit image I want to transform to 32-bit isn’t in the Siril window, it’s in the Pixel Math window. Is there a way to do it in Pixel Math ?

Where can I find a comand list, maybe the same as in the old Iris ?

ps,
I will test the synthetic bias later. I have made something similar in AstroImageJ.

/Lars

4

You can’t but Siril will automatically convert all 16bits data to 32bits data.

Now Siril is far from IRIS: Siril:Commands - FreeAstro

5

Thanks a lot, the command list are great !

/Lars