By attenuating the star component and putting the image in white version is more of the large amount of dust in the region.

 
Explanation : NGC 6946 (also tentatively known as the Fireworks Galaxy) is an intermediate spiral galaxy about 22 million light-years away,^[3]in the constellations of Cepheus and Cygnus. It was discovered by William Herschel on 9 September 1798. NGC 6946 is highly obscured by interstellar matter of the Milky Way galaxy, as it is quite close to the galactic plane. The true diameter of the galaxy is approximately 40,000 light-years or just about one-third of the Milky Way’s size.^[4] In the past century, ten supernovae have been observed to explode in the arms of this galaxy, which has been classified as a starburst galaxy

Ten supernovae have been observed in NGC 6946 in the last 100 years: SN 1917A, SN 1939C, SN 1948B, SN 1968D, SN 1969P, SN 1980K, SN 2002hh, SN 2004et, SN 2008S, and SN 2017eaw.^[6][7][8] This makes it the most prolific known galaxy for this type of event over a period of 100 years. By comparison, the Milky Way galaxy, which has double the number of stars as NGC 6946, averages one supernova event per century.^[9] It also contains a failed supernova, potential black hole-forming star N6946-BH1.^{[10]    Credit : Wikipedia}