M42 - The Great Orion Nebula.
The luminance channel for this image is a stack of 32 ten second 1x1 binned exposures using a 5" f/6 refractor.
A Gaussian histogram shaping was performed using AIP4WIN.
Each color channel is a stack of 16 twenty second images using 2x2 binning.
The color channels were balanced using AIP4WIN's Color Calculator using G2V star calibration.
The final image was composited using the G2V color balance.
(While this sounds complicated, using AIP4WIN this was achieved with just a series of mouse clicks, no slider adjustments were necessary at all.)
This image has been resampled down from its original size of 1290x999.