Processing parameters used:
First adjust levels to bring out the thin nebulosity
as much as possible (background is brought to a gray level):
- Minimum: 286
- Maximum: 1942
Next apply the DDP function:
- DDP
- Hightlight : 1177
- Edge : 0.01
Notes:
- DDP is used to convert wide dynamic range
linear CCD images
to nonlinear "photographic" images. Note
that M42 becomes "softer" and more
"photographic" in image quality in the
final step. Adjust the levels in the
final image to suit your preferences.
- If too large a value for the Edge
parameter is used, black rings will
appear around each star (especially
visible in the nebulosity). If this happens,
adjust the
Edge parameter interactively until the
black rings are not visible. For globular
clusters,the Edge parameter can be set
larger.
