Integrating narrow band with broad band images

Colin Clackson

I used WBPP to calibrate, align and integrate data taken with a L-Pro filter and data taken with an L-Extreme filter. The resulting master file shows high rejection of virtually all of the Ha signal. Does anyone have any thoughts on how to correct this?

BlockHead

HI Colin,

I think you need to dig a little deeper. Rejection of all the signal indicates there is a quality or signal difference between the frames you are integrating. You need to look very carefully at the registered data and make certain there are no pedestal issues or other things that can cause this issue. (like most of the data is poor and a few good frames get rejected).

If you make the registered Ha frames available I can check them out.. but what I would do is look closely at the values and make certain they make sense. Blink the files and see if there are any differences. IF there are... what are they and why?

-the Blockhead

Colin Clackson

Thanks for you reply. I'm afraid your suggestions re pedestal issues are a bit beyond my current skill level. Blinking the data doesn't reveal any obvious anomalies. WBPP doesn't reject any frames

BlockHead

Go ahead and make the registered frames available and I will check them out.

Upload to a cloud server and make the permission available to anyone with the link.

Thanks,

-the BLockhead

Colin Clackson

There are upwards of 150 registered images do you need them all?

What I'm trying to do is add Ha data to my images of M51. I've tried pixel math and it adds the HA data to but the brightness of the galaxy overall is reduced significantly.

BlockHead

Hmmm.. that is quite a bit.

So... before we do THAT... can you please send me a screenshot(s) of what you think is the problem?

Regarding incorporating Ha into M51... you know I have a video that covers this right? (Literally... adding Ha into M51 with continuum subtraction). I am not certain what your PixelMath expression is.. but it doesn't sound like my method which would be using non-linear (stretched) data that is screened together for the blend. 

The M51 example is part of Horizons.

-the Blockhead

Colin Clackson

I wasn’t aware of this module. I guess I’ll be furthering my education. Thanks for responding to my inquiries. I’ll get back to you if additional assistance is needed.