MLT - Sharpening with Multiscale Linear Transform

PixInsight - Improving the Non-Linear Image

MLT - Sharpening Details with Multiscale Linear Transform

updated: 2026-02-19

Purpose	In this step PixInsight is used to sharpen details in the nearly final image
Activation	Menu: Process 🡺 Multiscale Processing 🡺 MultiscaleLinearTransform and: Script 🡺 Image Analysis 🡺 Extract WaveletLayers
Input	a nearly final non-linear image, preferably of the the DSO object without stars after the MAS (Multiscale Transform Stretch)
Output	a sharpened image
Tutorials	From Blurry to Brilliant: Master Image Sharpening with PixInsight Multiscale Linear Transformation

Steps:

Open the nearly final non-linear image, preferably of the the DSO object without stars after the MAS (Multiscale Transform Stretch), e.g.:
Open Process 🡺 Multiscale Processing 🡺 MultiscaleLinearTransform and set these parameters:
Open Script 🡺 Image Analysis 🡺 Extract WaveletLayers and set the following parameters:
Click on OK and hide the wavelet windows that are being created by this script.
Go back to the MultiscaleLinearTransform and open the preview window to show the effect of the transformation.
Apply the process to the image.
... and check the result:

Before	After

Hint: A simpler method is to increase the sharpness and detail levels in Lightroom Classic (LRC). However, since LRC cannot import XISF files, this method only works with TIFF or JPG files.

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