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Gamma Correction questions.....

BendinggrassBendinggrass Posts: 1,380
in The Commons

I am looking at the settings for 3Delight rendering. 

There is a dial for Gamma Corredtion, which can be ON or Off. What are the reasons for selecting one or the other?

There is also a setting for Gamma, and it was set at 1 when I looked at this setting, even though I expected to be set at 2.2. Could a more experienced person here discuss this. Isn't 2.2 the preferred setting? Any help in gaining a better understanding of this will be greatly appreciated.

 

Thanks.

Comments

  • Richard HaseltineRichard Haseltine Posts: 108,056

    If you set Gamma to 2.2 you almost certainly want to turn Gamma Correction on. The Gamma value slider sets the adjustment for the render, the Gamma Correction button controls whether images are reverse-corrected before rendering, either assuming a value from their location or setting it explicitly in the Image Editor dialogue available from the image import/pick menus in the Surfaces pane. If you set gamma to 2.2 (or any other value than 1) and don't reverse the colour correction in most textures then the result will be washed out as the textures are effectively corrected twice in the same direction. You would leave Gamma value at 1 if you were going to post-process your images.

  • BendinggrassBendinggrass Posts: 1,380

    Thanks.

    Richard, I am not informed about many of the terms you use....

    You can send me to a thread that covers this if it exists..... but I have more questions..... :

    What does referse corrected mean?

    In some renders resulting from me playing with these 2 settings, I sometimes get coloured stripes/areas, on the figure. What is this and what does this result from? I guess here I am asking about the mechanism that leads to that.

    Thanks.

  • Richard HaseltineRichard Haseltine Posts: 108,056

    Essentially it's a brightness/contrast control - the human eye does not respond equally wel to all tones so gamma correction adjust the balance to make images easier to see. Try lighting a room with a point light with Gamma 1 andf then change Gamma to 2 and compare the results. You can make this adjustment in an image editor, but then you lose some data as the file is saved in only 8-bits per channel colour (256 shades from black to full colour) while the internal correction is done with the full bit depth supported by 3Delight.

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