This image of NGC 6914 contains 25 nebulas for Sadr region: vdB131, vdB132; Barnard 346; LDN 891, 892, 894, 895, 897, 899, 900, 902 and LBN 248, 251, 259, 268, 270, 273, 274, 279, 280, 281, 288, 292, 293, 305.
NGC6914 RGB and HSO were used for annotations. Main image is HSO and has combined HSO SNR of 180. O3 was suppressed, since it was turning some areas into white.
Panel A: HSO
Panel B: HSO annotation
Panel C: RGB annotation
Processing:
Cropping for Ha, O3, S2, R, G and B
GrapXpert was used to eliminate background. GraXpert somehow distinguish nebulosity.
RGB was combined
Color Colib for RGB
Blur and Noise XT for Ha, O3, S2 and RGB
Star XT for RGB as well as Ha, O3, and S2. RGB stars were kept.
Manual stretching (with HT) for Ha, O3, S2, RGB (no stars), and RGB-stars (two different intensity stretches).
1. Processing (panels C)
RGB no stars were masked by Lum.
Local Histogram Equalization: Kernel radius of 40 and 150
Multiscale-median transform for sharpness; strong 0.4-0.5 setting.
Curves: brightness is manipulated
Mask off.
Added saturated RGB stars (strong stretching).
Annotation
1. Processing (panel A and B)
Combined HSO as R-G-B
Noise XT
Stretched again.
Played with Hue-Saturation until final image. O3 was suppressed.
Lum for HSO was used as mask.
Local Histogram Equalization: Kernel radius of 40, 150 and then 300 (histogram resolution is 10-bit!)
Multiscale-median transform for sharpness; strong 0.4 setting.
Curves: saturation and brightness are manipulated
Red were separately manipulating using ""red mask" scripts.
Mask off.
Added RGB stars (weaker stretched).
Done
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