Manual alignement of RGB frames

Software Siril
1

Hello,

I am trying to RGB compose 3 fits, but the images are not alligned.
I tried the alignement in the RGB composing, but it did not work well.
I tried putting the 3 images in a sequence and align this way, but this also failed.
They are what looks like manual alignment numbers in the RGB composing box, BUT it is not possible to edit them :frowning:

Would it be possible to enable these control for manual editing so that one could manually adjust the frames?
Thanks,
Cyrille

image
image1003×587 180 KB

1 Like
2

Hello.
Why alignment in sequence fails? It shouldn’t: I do this way all the time.

3

Hello,

I would love to know why it’s failing! but I am too new to the whole thing to have a clue.
I can provide the 3*64MB fits to anyone who needs them for testing/debugging/finding what I am doing wrong


Thanks,
Cyrille

4

You can share your files yes. But everything is written in the console.

5

Hello,

The problem is that to siril, it looks like it worked, no errors are reported, it’s just that the end restul is not aligned


However, I think that I might know the cause of the error. I think that my 3 images were not histogram stretched correctly. BUT that lead me to another issue:-(

I was able to stretch the S and OII layers, but when I tried doing the same with the Ha layer, it failed in this following way:

This is my “base” Ha layer using linear visualisation:
image

This is the same layer using auto-stretch visualisation:
image

But when I open the histogram tool and click on the “auto” button, I get a white image:

image
image715×653 109 KB

It does not mater what I do when I try to manually adjust the histogram, I am unable to get to anything remotely as nice as the one from the “visualisation/auto stretch” mode. Is there a way to get the computer parameters from there to apply them to the histogram tool?

Thanks,
Cyrille

6

Here is the link to the HA file
https://drive.google.com/file/d/1EtPvq5SL0e9W-mJ6IjzMq1Mzyx7onp_g/view?usp=sharing

7

This works as expected, to view the stretched image you need to move the visualisation cursors, similarly to that Why are exported images so dark? in the FAQ.

8

They are indeed read-only, displaying registration results, I don’t remember why we didn’t handle user input from there
 Anyway, this tool is becoming deprecated in 1.2, I’m not sure we’ll update it.

9

Yes, I understood this


However, when I use the histogram tool and click on the “auto” button (the cog one), for my S or OII images, I end up with a setting that looks very similar to when I select the “auto stretch” in the visualisation drop down.

But for the Ha image, the cog button yeilds a white image and regardless of how I try to manually tweak the histograms sliders, I am not succeeding in getting anything that looks remotely nice.
Is there a way (console?) to get the values that the “auto stretch” selection uses so that I can copy/paste them in the histogram window?

Thanks,
Cyrille

10

I had no problem to apply autostretch from the histogram tool to your image, it’s not the histogram sliders that must be set to 0 and max but the image visualization sliders below the image display.