Posted 19 April 2013 - 05:10 PM
Pentax 6x7, Takumar 400mm f/4 @5.6, 57 min, Kodak E200, Nikon Coolscan 8000 ED.
Clik here for higher resolution (5.9 Mpix).
Maybe you can note some "strange" patches in the image. Those are parts where I had to mask out some faults in scanning.
- Glen A W likes this
Posted 21 April 2013 - 11:15 PM
Posted 28 April 2013 - 01:38 PM
Posted 12 October 2014 - 03:28 PM
Here is Vulpecula in the version 2014! The original scan was not very good so I let done another one. I have also undertaken changes in my image processing technique. I hope the changes were for the better.
Click on the photo for lower resolution and here for higher resolution.
Edited by Michal1, 13 October 2014 - 09:05 AM.
Posted 12 October 2014 - 06:19 PM
Very nice. The processing looks good. What did you change in your processing?
Posted 13 October 2014 - 09:05 AM
Dave, thanks. I learned several useful tricks during the last year. Here are those most important of them.
1) When I processed my image of IC1396, I learned how to make a HDR image from two frames with different exposure times. I roughly followed this tutorial. I found that this technique is useful even when I have only one image of the object. First, I process the photo normally by curves. But by doing this, the star centers get burned - appearing with no or little saturation. To recover the burned parts, I take the original image, at which the stars still have their color and use the HDR technique to transpant the original star centers to the adjusted image.
2) To selectively increase saturation of pixels with low saturation. This helps to bring out the faint nebulosity and the colors of the dark areas.
3) For the correction of vignetting, photo editing software often offers a special function. However, other way showed up to give better results. First, I select the dark corners of the image by the lasso tool with the smoothing parameter as large as possible. Then I brighten the corners by Levels or Curves. It is better to make a rather small adjustment. Then I deselect and repeat the same procedure several times. When the vignetting is suppressed one can bring out better the natural features in the photographed scene.
4) When processing this image, I found another trick that seems to have potential. Usually, when I tuned the colors of the image by curves, I also affected brightness as the side effect. In Photoshop, it is better to make two layers and use one to control luminosity and the other to the colors.
Posted 14 February 2015 - 02:05 PM
Attached is a screenshot of the field (from Cartes du Ciel in Distro Astro 3.0)
to compare with your photo.
The brightest star near the center/center right is Alpha Vul;
the brightest star near the top of the frame is Beta Cyg.
The dark area is collectively known as the Vulpecula Rift.
The dark area near the left margin of the photo consists mostly of LDN 798 (np) and LDN 787 (sf).
The small dark curved region north of the photo's center is LDN 792.
Edited by catalogman, 14 February 2015 - 02:09 PM.
Posted 14 February 2015 - 02:06 PM
Attached is a second screenshot of the field (from Cartes du Ciel in Distro Astro 3.0)
that features the lower half of your photo.
The cluster near the bottom of the frame is the Coathanger Cluster.
The prominent dark areas (in order, moving north of the Coathanger) are:
LDN 755 (smallest), LDN 767 (largest), LDN 778/781 (V-shaped).
The dark area nf of the Coathanger (bottom center of photo) is LDN 770/776.
Edited by catalogman, 14 February 2015 - 04:58 PM.