The cluster spans about ten million light-years and has an unusually high proportion of dark matter. The Hydra Cluster is a galaxy cluster that contains 157 bright galaxies, appearing in the constellation Hydra. # 08JUL2021 THE HYDRA CLUSTER ABELL 1060 - PRO DATA SET The goal is to get the background as dark as possible without losing the faint signal.Ī pure black sky may be our mental picture of deep space, but it does not represent reality and will tend to look unnatural and over processed. Start to explore space from the comfort of your home! A good starting value is around 30 in each of the RGB channels. One technique that can be applied is changing levels to change the black point.Įxamine the pixel values, and as stated, it should not be zero, nor should it be set too high. Some of the data that gets thrown away may be faint nebulosity.Īstrophotographers should strive to keep as much actual data as possible, and sometimes the deep black of space needs to be lighter than black. These are the pixels that contain values but are thrown away when clipped. This makes the black darker and the light lighter, but in the process, you lose data. This can happen by clipping the black values during a stretch or by increased contrast. A pixel value of zero is pure black (pure white = 255). One mistake new astrophotographers make is to make the black of space pure black. These sources included sky glow and emission from other nearby objects. There is light from many sources in the sky background. ![]() ![]() Aside from the noise, there is a faint signal.
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