Light pollution filter

Forum|Forum|5 years ago
April 18, 2021
2 replies
492 views

Is it possible to create an Adobe light pollution filter based on the transmission spectrum of a 'hard' filter (I.e. physical glass filter)? An example filter profile is attached.

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Rob_Cullen

Community Expert

A little too technical for me! but nearest that I can imagine would be two ways-

1) Use the HSL Luminance panel to reduce (filter 'out') specific color 'channels'

2) Use a Gradient Filter or Brush Adjustment with Color Range Masking to selectively reduce exposure of colors.

As for filtering multiple parts of the spectrum (as may physical filters) - beyond me. 😞

Regards. My System: Windows-11, Lightroom-Classic 15.3, Photoshop 27.5, ACR 18.3, Lightroom 9.3, Lr-iOS 10.4.0, Bridge 16.0.3 .

Rob_Cullen

Community Expert

Nothing attached!

Are you talking White Balance, HSL adjustment, Tone Curve Channels,,,? Curious to understand.

Regards. My System: Windows-11, Lightroom-Classic 15.3, Photoshop 27.5, ACR 18.3, Lightroom 9.3, Lr-iOS 10.4.0, Bridge 16.0.3 .

D

defaultb829v2ir3pm3Author

Participant

Thx for that, a few issues attaching it seems.

The question was based around simulating the use of a physical light pollution filter that attenuates specific light wavelengths (from sodium and mercury lamps). While lightroom (and correct me if wrong) allows you to adjust colours etc., the question was using a more analytical approach to raw file filtering. I'll have another go at attaching the light pollution transmission spectrum.

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