The Rosette Nebula
This is a natural color image. This image used rnc-color-stretch that
does not lose color during the stretch. How do we know the colors are
reasonable? The star colors can be checked against stellar photometry.
Faint red stars, they have B-V > 2. Bright orange stars
have B-V of about 1 to about 2). The blue-white stars have B-V in the range of
0 to -0.5. The colors closely follow the color sequence in Table 1 at
http://www.clarkvision.com/articles/color-of-stars/.
Solar-type stars have a B-V of 0.63 and appear close to white (daylight
white balance).
Canon 7D Mark II 20-megapixel digital camera and 300 mm f/2.8 L IS II at f/2.8. Twenty nine
60-second exposures at ISO 1600 were added (29 minutes total exposure). No dark frame subtraction, no flat fields. Tracking with an astrotrac and no guiding.
Stretch with rnc-color-stretch
http://www.clarkvision.com/articles/astrophotography-rnc-color-stretch/More info on this image and the processing:
http://www.clarkvision.com/galleries/gallery.astrophoto-1/web/rosette_nebula_c01.22.2015-t2.0J6A3448-95av29-rs.h-0.45xc1s.html
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