Stretched image

HDR multiscale tool

Compresses large bright regions so that their structure shows (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

Amount

How far the bright regions come down.

Layers

The wavelet layers kept as they are; what is larger is compressed. Fewer layers flatten finer structures.

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

When a bright core is burnt out next to faint surroundings: a nebula core, a galaxy, a globular cluster.

Image

Works only on a stretched image.

Example

withoutHDR multiscale 60 %