Ngc 300

[SB (Chris)]

Hi Everyone,
This is NGC 300. I used ASI 193 MC for the RGB and ASI 183 MM for Ha and OIII to pick up the emissions.

90x 300 Seconds RGB, Ha and OIII.

Software: DSS, RC Astro Star Ext, RC Astro Noise Ext. Astrosharp, Affinity.

https://www.astrobin.com/2h1k7e/

Comments welcome.

Chris.

[alpal]

Hi Chris,
quite good but something has gone wrong with the processing.
The background is completely black -
it is reading 0 out of 255.
It would normally read 20 to 30 out of 255 bits.

cheers
Allan

[SB (Chris)]

Originally Posted by alpal

Hi Chris,
quite good but something has gone wrong with the processing.
The background is completely black -
it is reading 0 out of 255.
It would normally read 20 to 30 out of 255 bits.

cheers
Allan

Thanks Allan
That’s very helpful. I’ll have a look at that and see where that happened.

Chris

[alpal]

Thanks Allan
That’s very helpful. I’ll have a look at that and see where that happened.

Chris

Hi Chris,
it can be avoided using the free program that I use:
NASA FITS Liberator.
https://esahubble.org/projects/fits_.../download_v30/




Take the stacked FITS file in and use the stretch function x^(1/5).
Move the sliders full left and right -

that will give you maximum compression so that all levels
are spread out evenly over the 255 possible bits when you finally
convert from Tiff to jpeg.


cheers
Allan

[Dave882 (David)]

Good suggestions made re the background, but otherwise I quite like this- in particular the detail in those Ha regions. Really nice!

[SB (Chris)]

Originally Posted by alpal

Hi Chris,
quite good but something has gone wrong with the processing.
The background is completely black -
it is reading 0 out of 255.
It would normally read 20 to 30 out of 255 bits.

cheers
Allan

Hi Allan
I loaded Fits Liberator 4 and will give that a go. Where do you get the background bit values from?

Chris

[alpal]

Originally Posted by SB

Hi Allan
I loaded Fits Liberator 4 and will give that a go. Where do you get the background bit values from?

Chris

That is on the final .jpg when you use the eyedropper in Photoshop
to sample any areas.