Messier 13 (Hercules Globular Cluster)

Acquisition:

Bortle 6-7 skies
Nikon D7000 camera
Orion Apex 102mm telescope, 1300mm focal length
Orion AstroView EQ3 with single-axis drive
30s x 53 frames
f/12.7
ISO 1600

Processing:

Siril:

Background color calibration
Background extraction
Histogram auto-stretch
Histogram midpoint adjustment
Deconvolution

GIMP:

Chroma and luminance denoising (G'MIC-Qt plugin)
Color levels and saturation adjustments