odd artifacts in my images

[dsnay]

HI all,

Anybody have any idea where these artifacts are coming from?
The seem to always be in the same place and darks don't get rid of them.



I'm using the DSI Pro and these seem to be in lots of my Red and Green data sets and in various positions.

thanks,
Dave

[ricksastro]

Those are simply hot pixels in the individual subframes...when you align the stars, they give a history of how your mount tracked over the duration of the session.

I use Maxim which has Hot Pixel removal tool which wipes out errant pixels.  Barring that, you can use image processing programs to clone them out.

Darks won't always wipe them out.

Rick

[Jean-Yves]

Hi Dave,

I have good results with Ray Gralak's Sigma software to remove them when combining and stacking the frames. It has a feature called smoothing that works very well:

http://www.gralak.com/Sigma/index.html


Cheers

Jean-Yves

[dsnay]

Those are simply hot pixels in the individual subframes...when you align the stars, they give a history of how your mount tracked over the duration of the session.

I use Maxim which has Hot Pixel removal tool which wipes out errant pixels.  Barring that, you can use image processing programs to clone them out.

Darks won't always wipe them out.

Rick

Thanks Rick,

I knew you'd come through for me.
My next experiment will be to image through the camera lens and use my LPI to guide through the scope. Assuming the LPI is good enough, I should be able to track a little better.

thanks,
Dave