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Nvidias Dynamic Contrast Enhancement and Colour Enhancement
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Our final image test has a few surprises on the Nvidia card. Firstly with all the blue, which caused issues in previous scenes, it could have been possible for the image to be ruined again. This does not happen and the water actually becomes deeper in colour. There is also a distant fish on the top left of the image which is more visible on Nvidia now than it is on ATI. There is however one stand out problem with the Nvidia capture which surprised us. The dark fish near the front left of the image actually loses further detail in the new Nvidia image, a complete contrast to the improvements we saw in detail levels for previous comparisons.
If we firstly study the blue fish front left, we can see it looks considerably more vivid than before. Subjecting the fish to analysis we notice that the magenta content on the enhanced image has been reduced by 10-15%, the cyan content has not been touched. The removal of magenta from the blue has enhanced the colour and it gives the fish more vibrancy. Analysing the ocean in the background shows the enhanced mode has reduced the yellow content by around 10-15% which again enhances the primarly colours of cyan and magenta which combine to make a rich blue. Again Stuart’s observations with the dark coloured fish in the foreground would verify the fact that the enhanced algorithm is trying to boost contrast by adding 3-4% extra black into dark zones. While this isn’t really needed overall this image is better with the enhanced settings.
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