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2.3.17 Selective Color Correction in SilverFast Ai Studio 8
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In SilverFast Ai Studio 8, the tool window for Selective Color Correction is a little different compared to the SE and SE Plus versions. Here, there are two options for changing colors: a color circle around which the six base colors are arranged, and three sliders for hue, saturation, and relative lightness. This tool offers far more options for selective color correction than in SilverFast SE (Plus).
The dress in the example picture that we want to correct is actually blue. In the photo, though, it seems slightly turquoise, which may be due to the combination of the exposure situation, film material, paper type, and the aging processes. This green contamination in the blue has to be corrected. First, the image should be neutralized with black, white, and mid pipettes or a suitable image auto adjust (top image), then the tool palette can be opened with the "Selective CC" button. Click on the color of the dress to select the turquoise as the starting color for processing, and it is then displayed in the middle of the color circle. To reduce the green contamination, click on the green circle at the top left at the edge of the color circle and pull the color vector carefully towards the middle of the circle. The mouse pointer uses a minus sign to symbolize that the green portion will be removed from the selected color. So the blue of the dress is already restored, but it's still a little washed out. So we strengthen the blue portion by pulling the color vector from the inner circle outwards towards the small blue circle. In our case, just a slight addition of blue is enough. The HSL sliders can also be used to carry out this color correction just as easily. Again, first the color of the dress is selected by clicking on it. With the H slider, move the color value from green at the top towards the blue at the bottom. With the L slider, you can lighten the color up a little, then push the S (saturation) slider up towards a pure blue, which removes a little of the red. With the very powerful color vectors in SilverFast Ai Studio 8, colors can even be changed entirely. Let's assume you need a picture of a red tulip, but all you have is a purple one. With selective color correction, that's easy to manage. First, click on the flower to select the purple as the color to be processed. Pulling the color vector from the middle of the circle outwards towards the red still looks unnatural. Only after adding a little cyan is the problem corrected and the tulip blossom can shine in a radiant red. Instead of adding a lot of cyan, it would also have been possible to add a little green and a little magenta, or a little blue and a little yellow. The result would have been a red flower in any of these cases, but with very slightly different nuances in the red. 
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