Ralph thx for your review,
Hereby a version that's a bit more normalized....the green is OIII lines,
the red the HAlpha line.
I am still trying to get the touch on color imaging with multiple layers so
pls if yoy have any tips post them.

Thx
Dirk

"Ralph Hertle" wrote in message
...
DvandenH:

The images are beautiful to see.

I am a new guy to celestial imaging, however, I have lots of visual and
computer imaging skills.

From my lurker's viewpoint I find that the lightened version has lots more
bluish white in the central area, however, the structures visible that are
green in the former image are not visible in the lightened version.

The bluish white image shows a little more at the edges of the structure,
and that is always an area of interest to me. I try to see the extent of
the object, and I am always suspicious of images of galaxies that have a
sudden cut off of light at the outer edges. On the other hand maybe the
objects do in fact have a more pronounced boundary edge and do not fade
gradually at the greater edges.

The bluish white version has better background blacks, and more visible
tiny stars, however, all the stars are wider and appear to be slightly out
of focus.

The bluish white version doesn't appear to be a lightened version with
greater visible light intensities. Did you raise the visible intensities
of some filtered images and not others? Also, if the bluish white version
is slightly out of focus does not that ruin some of the modulations of the
lighter lights?

My computer graphics card and monitor can display 255^3 possible color
hues, and it has [claimed and not possibly actual] 1000:1 displayed steps
of contrast. What I often do is to plug in my big high-res CRT monitors
that do not have deep blacks and that have lots better faded visible
contrast areas than the LCD screen monitors.


Ralph Hertle

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