Quote:
Originally Posted by PRejto
Allan, I gave this a bit of a tryout and yes the transitions do look quite smooth in comparison. I will need to get more experience with this program. Thanks again for pointing it out to me.
Peter
|
Thanks Peter,
I always stretch the 32 bit FITS file with NASA FITS Liberator
& then save it as a
16 bit Tiff file for Photoshop.
I have found the x^(1/5) function is the best -
it offers the most compression.
Be careful of the left & right sliders.
You need to move the left slider to just get rid of the blank area
or fully left -
& the right slider so you don't clip the brightest stars.
( which will appear as vertical lines)
It will then need further stretching in Photoshop but not much.
It's a powerful function that does most of the stretching work for you using mathematics.
You can even experiment with different functions depending on the picture.
ArcSinh(x) can be good for nebulas.
x^(1/5) can really help in those tough areas where you're trying to pull
galaxy arms out of the noise in the black point.
cheers
Allan