by Ann » Mon Dec 05, 2022 8:42 pm
Anthony Quintile wrote: ↑Mon Dec 05, 2022 6:45 pm
@Ann
You are absolutely correct that LBN 524 should be more blue, and in fact this has been bugging me. Please read for my revision D description at Astrobin here:
https://www.astrobin.com/y23yjl/F/, written before submitting to APOD.
Since I wrote that, Pixinsight has released it Spectrophotometric Color Calibration process based upon the newest Gaia DR3SP star catalogs.
Even when I apply that and no other color adjustments, however, that region is not nearly as blue as many folks show in their images. Even when I oversaturate, LBN 524 is just a bit pale blue even when the reds and yellows are overdone with the equal adjustment on saturation.
At some point I do need revisit the processing on this and capture that blue better. I am really on a learning mission to try to accurately capture color in my images.
I was kinda hoping no one would notice! ;-P
Thanks for your other kind comments!
-Anthony Quintile
The Light, the Dark and the Dusty. Original version by Anthony Quintile.
@Anthony,
I checked your website, and I like the original version of your image better than the one that became an APOD.
In your original version, the reflection nebula does look blue. It doesn't look
very blue, but believe me: As a self-appointed Color Commentator I am acutely aware that the color of reflection nebulas is always moderated by the presence of dust. That means, for example, that reflection nebulas surrounding A- and B-type stars can indeed be reddened by dust to a whitish blue, grayish blue, greenish blue or even "beige blue" hue.
Check out
this page to compare the blue hue of the Rho Ophiuchi nebula with the washed-out dust-reddened color of IC 4603.
It is clear to me that vdB 155 is a blue reflection nebula whose blue hue is relatively strongly reddened by dust. Still, it is not so reddened that its blue color has been lost completely. I believe that your original image did a great job at bringing out the "true" color of vdB 155.
Ann
[quote="Anthony Quintile" post_id=327584 time=1670265928]
@Ann
You are absolutely correct that LBN 524 should be more blue, and in fact this has been bugging me. Please read for my revision D description at Astrobin here: [url]https://www.astrobin.com/y23yjl/F/[/url], written before submitting to APOD.
Since I wrote that, Pixinsight has released it Spectrophotometric Color Calibration process based upon the newest Gaia DR3SP star catalogs.
Even when I apply that and no other color adjustments, however, that region is not nearly as blue as many folks show in their images. Even when I oversaturate, LBN 524 is just a bit pale blue even when the reds and yellows are overdone with the equal adjustment on saturation.
At some point I do need revisit the processing on this and capture that blue better. I am really on a learning mission to try to accurately capture color in my images.
I was kinda hoping no one would notice! ;-P
Thanks for your other kind comments!
-Anthony Quintile
[/quote]
[float=right][attachment=0]APOD 30 November 2022 original version.png[/attachment][c][size=85][color=#0040FF]The Light, the Dark and the Dusty. Original version by Anthony Quintile.[/color][/size][/c][/float][img3="The Light, the Dark, and the Dusty. Image Credit & Copyright: Anthony Quintile"]https://asterisk.apod.com/download/file.php?id=46263&t=1[/img3]
[clear][/clear]
@Anthony,
I checked your website, and I like the original version of your image better than the one that became an APOD.
In your original version, the reflection nebula does look blue. It doesn't look [b][i]very[/i][/b] blue, but believe me: As a self-appointed Color Commentator I am acutely aware that the color of reflection nebulas is always moderated by the presence of dust. That means, for example, that reflection nebulas surrounding A- and B-type stars can indeed be reddened by dust to a whitish blue, grayish blue, greenish blue or even "beige blue" hue.
Check out [url=https://www.cloudynights.com/topic/716582-rho-ophiuchi-ic-4603-and-ic-4604/]this page[/url] to compare the blue hue of the Rho Ophiuchi nebula with the washed-out dust-reddened color of IC 4603.
It is clear to me that vdB 155 is a blue reflection nebula whose blue hue is relatively strongly reddened by dust. Still, it is not so reddened that its blue color has been lost completely. I believe that your original image did a great job at bringing out the "true" color of vdB 155.
Ann