how to use the Linear Mask in MLT tool

[alcol]

Hi there

Can someone point me in the direction of information on how to use the Linear Mask in the MultiscaleLinearTramsform tool. I have tried and failed to get it to work. Probably very simple but I can't get it to work.

Thanks

Alec

[astroedo]

It's very simple indeed! ;-)

You must use it for denoising at linear stage: activate the mask checking the "Linear Mask" checkbox.
Create a Preview on your image to test the masking and denoising parameters.
Deactivate the Screen Transfert Function and Check the "Preview Mask" flag.

Set the "Amplification" factor: this is a multiplicative factor applied to the image that enhance it to create a protective mask.
Typical values range from 60 to 110.
Drag and drop the blue triangle of MMT process on your preview: you will preview the mask that will be applied.
Trim the amplification factor and the smoothness factor to get the desired masking effect.

When done Deactivate the "Preview Mask" flag, reactivate the Screen Transfer function and proceed as usual with denoise.

The denosing effect will be applied with the built in masking.

Clear Skies

[alcol]

Hi Edoardo

Very many thanks, easy when you know how. Followed your clear instructions and it all worked. The process is superb, noise has vanished.

Very much appreciated.

Best wishes

Alec

[Juan Conejero]

This may help too:

http://pixinsight.com/examples/M81M82/index.html#Noise_Reduction