Eyeon:Manual/Fusion 6/Light Trim

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Light Trim

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Light Trim [LT]

Image:Icon_LightTrim.png

This tool emulates film scanner light trims. By design, this tool works best with logarithmic data, such as the images stored by the Cineon file system. When logarithmic data is provided, the Light Trim tool can be used to increase or decrease the apparent exposure level of the image.

Contents




Controls


Lock RGBA

When selected, the Lock RGBA control collapses control of all image channels into one slider. This selection is on by default. To manipulate the various color channels independently, de-select this check box.


Trim

This slider shifts the color in film, optical printing and lab printing points. 8 points equal one stop of exposure.






Tips for Light Trim (edit)

I would need a developer to verify this, but I am pretty sure that a Trim value of 8 represents 1 stop of exposure in old film light terms, and 1 stop of exposure is a lift or increase in brightness of the log (0-1024) data by 96. 96 divided by 8 equals 12, so a trim of 1 lifts the color by 12. So to mimic this tool using just a brightness contrast we would apply the brightness contrast to the log image, and increase the value by 12/1024 or 0.01171875 per each integer trim value.

--Izyk 04:16, 5 September 2011 (EDT)

- A trim value of 1 = 12.5 cineon code values, ie. a trim of 1 = 12.5/1024 = 0.01220703125. Stuart 16:11, 5 September 2011 (EDT)



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