[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
RE: [APML] OT: DSS image processed: Barnard 142/143 Complex("E"Nebula)
If you
think back to the "face on Mars" hoopla of several years ago you get an
impression of background behind my question. You take a 4-bit image (16
grey levels) and expand it to an 8-bit image (256 grey levels), than add
interpolation and processing, with imaging artifacts included, you can generate
a whole new industry! :)
I'll
look at the 'without' image.
Thanks.
Hi
Richard,
no, I'm not "generating" data! If you take a look to the image
with the stars
removed, you will view that there are a lot of gradients
that are not visible
due to the high density of the star
field:
http://www.pleiades-astrophoto.com/pixinsight/examples/B142_woStars.jpg
Simply,
I'm enhancing that gradients over the stars to make them visible to
the
eye, that's all!
Regards,
Vicent.
At 19:00 13/10/2004
-0500, you wrote:
This is not intended as a criticism, but a
question; the hairs on my neck go
up when the "invisible" is
"revealed". Is it REALLY exposed data or is it
processing
artifact?
If it is intended, as suggested by comments that I trimmed
off, that the
resulting images are for "artistic" presentation then I
have no problems.
On the other hand, if the resulting images are for
scientific analysis, have
you revealed information or manufactured
data?
-----Original Message-----
From:
astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Vicent
Peris
Sent: Wednesday, 13 October, 2004 09:24
To: Discussion of Film
Astrophotography
Subject: Re: [APML] OT: DSS image processed: Barnard
142/143 Complex("E"
Nebula)
Hi Ray,
I've made two crops of
a selected area of the image at full size, before and
after all of the
processing:
http://www.pleiades-astrophoto.com/pixinsight/examples/B142_Crop_Before.jpg
http://www.pleiades-astrophoto.com/pixinsight/examples/B142_Crop_After.jpg
As
you can see, there is no data loss. In fact, there is much
more
perceptible data in the second image! Star colors are more
differentiated:
you can easily view the redder stars surrounding the dust
clouds. On the
other hand, brightness gradients on the clouds are also
more defined, due to
applied noise suppression and large-scale processing
methods. Therefore, if
you take into account only the *significant* data
of the image, you'll see
that the applied processing has recovered a lot
of data which was invisible
in the initial image. Really, do you think
there are more things to see into
the
original?
...
trimmed
...
_______________________________________________
Astro-Photo
mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo
Vicent Peris
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo