Stretched image

Local contrast tool

Local contrast per scale of detail (à trous wavelets).

How to use it

1. Open Tools and click the tool: it is added after the selected step.
2. Move its settings: the image follows as you move them (Live preview).
3. Press Apply to keep the result. Before / after compares at any time.

Settings

Fine

The small structures: filaments, the edge of a dust lane (about 16 to 32 pixels).

Medium

The middle-sized structures: clouds, folds (about 64 to 128 pixels).

Large

The large shapes, which give the image its depth (about 256 to 512 pixels).

Mask

Everywhere, Bright parts (the object, not the sky) or Dark parts. Stars are not in the mask.

Threshold

Where the mask starts, from the sky background (0 %) to the brightest part of the object (100 %).

When to use it

Near the end, to give relief to the nebula. One slider per scale of detail.

Image

Works only on a stretched image.

Example

withoutwith Local contrast