staralignment video 'blink' trick

[Nocturnal]

Hi,

thanks for posting the video. It's a bit odd to listen to a machine talk but he didn't make too many mistakes so it was fine. I could still tell Juan wrote the script though, can't hide that easily

Things we pretty straightforward but I wanted to confirm that I understand the blink trick correctly.

- define a preview on image A
- create a pixelmath instance whos expression is simply 'image B'
- apply the PM instance to the preview
- undo the action and redo it to blink between the two

So the PM action simply replaces the source (A) with B and as long as they are the same size and are registered you can use this to blink?

[Jack Harvey]

That is how I saw it, but it went quick and will wait to see what Juan says.  Also It would have been interesting to add a bit of a trailer on how to register more than one image to the reference image.  Can you specify a reference image and then add 2 or more views to register and merely then activate the "Global" icon on the star alignment.  Or do you have to do each image to register individually and sequentially?

[Juan Conejero]

Hi Sander,

I could still tell Juan wrote the script though, can't hide that easily

No, actually it was Alex, I just moved the mouse! :lol:

So the PM action simply replaces the source (A) with B and as long as they are the same size and are registered you can use this to blink?

Yes, that's just how it works. Don't forget that the Rescale option of PM must be disabled. And in the case of the tutorial, both images must have the same STF applied for the comparison to make sense.

I have in mind a small tool to make these replacements without PixelMath, including automatic blinking at a specified interval. It's in the TODO...

[Juan Conejero]

Hey Jack,

Also It would have been interesting to add a bit of a trailer on how to register more than one image to the reference image.

I'm working on the second tutorial, which explains that part. Right now, Alex is telling me the script :lol:

[mmirot]

The video tutorial is great.
Keep them coming Juan.

Max Mirot

PI is the Greatest . The last 6 images on my page are done with PI

http://www.pbase.com/maxmsm/astro_images

[Simon Hicks]

I have to echo everyone else's comments....the video tutorial idea is excellent. Apart from learning a lot about the star alignment technique I also learnt a few other tips...the blink thing being just one of them. Its amazing how differently (i.e. un-efficiently) I have been using PI. Just seeing five minutes of Juan using it properly is very valuable.

Please keep the videos coming!

And congratulations for managing to get Stephen Hawking to do the narration.  :lol:

Cheers
              Simon