Sky & Telescope - June 2022 - 68

Color Choices
1
4
2
5
3
MULTIPLE CHOICE You can combine images of nebulae using
broadband color and narrowband filters in several ways. This colorful series
shows NGC 7635, the Bubble Nebula, in Cassiopeia through various
filter combinations. 1 Broadband RGB. 2 Enhanced color by adding Hα
to the RGB image. 3 Bi-color image using Hα as the red channel and O III
as both the green and blue channels. 4 Narrowband image combined in
the Hubble palette (red is S II, green is Hα, and blue represents O III).
5 Narrowband image combined in the CFHT palette (Hα is assigned to
the red channel, O III to green, and blue represents the S II component).
While you process your images, remember that while
Narrowband is also a bit different than broadband
imaging in that it's dominated by Hα signal. If we simply
combined narrowband channels based solely on the signal
recorded in three exposures of the same length, the result
would be primarily tinted the color that Hα is assigned. For
example, a Hubble palette image would look mostly green. In
order to compensate for this imbalance and achieve a wide
range of colors in a narrowband image, the three component
images need to be stretched so that each color channel contributes
fairly equally to the final result.
68 JUNE 2022 * SKY & TELESCOPE
perception is subjective, measurement is not. It's important
to use your eyes and objective measurements of pixel values to
help achieve the result you desire. Your eyes, your screen, and
even the ambient light conditions will influence what you see
but do not alter the image data. I often rely on the histogram
displays of my images to evaluate whether or not the background
is neutral and which colors dominate the midtones.
When it comes to achieving satisfying color images, the
same principles apply regardless of which type of camera or
filter set you use. Just remember to think about color at each
stage of the imaging process, from acquisition to the final
presentation of your work.
¢ Contributing Editor RON BRECHER is always excited to
photograph the night sky from his backyard observatory in
Guelph, Ontario.

Sky & Telescope - June 2022

Table of Contents for the Digital Edition of Sky & Telescope - June 2022

Contents
Sky & Telescope - June 2022 - Cover1
Sky & Telescope - June 2022 - Cover2
Sky & Telescope - June 2022 - 1
Sky & Telescope - June 2022 - Contents
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