Gamma
Gamma correction, or often simply gamma, is the name of an internal adjustment applied to compensate intensities in imaging systems. Output intensity I_out is related to the input I_in by the following expression:
I_out = I_in^(1 / gamma)>
where the input intensity is normalized to one. Independently of the value of gamma the highest intensities remain relatively unchanged, while lower intensities are relatively modified.
For gamma values larger than one, dimmer intensities are enhanced relatively to the higher ones.
In Huygens
Currently in Huygens Essential there are basically three contrast modes:
- Linear (gamma = 1)
- Compressed (gamma = 1.7)
- Widefield WF mode (adaptative mapping, to contrast data against the Wide Field Microscope blur).
These modes map logical intensities from the dataset to the screen, which usually has another extra gamma correction. (A screen monitor rarely has a gamma of one. Mac screens usually have 1.8, while Windows PC's use 2.2).
In Huygens Professional's Pro Slicer, under the Contrast tab, you can find five different gamma modes. On top of the three ones mentioned above, you have another two stronger modes for compressed and widefield.
More information
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