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I like to use black-backgrounded slides for my conference presentations. However, as research papers use white-backgrounded figures, they should be converted. A good option is inverting the colours. However, often the inverting does not give nice colors. Is it possible to do the same process but use nice, predefined colors, e.g. material colors?

Is possible, Affinity-based solutions are especially appreciated!

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2 Answers 2

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You obviously want to keep red and blue hues, but invert the luminosity levels. It can be done in systems which allow a little more "what actually is adjusted"-options for the curves adjustment tool than Photoshop. Free systems with it are at least programs GIMP, Krita and Paint.NET. I do not have Affinity Photo available now, so I cannot check it.

Here's the luminosity level inversion done with Curves+ in Paint.NET.

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You may want to keep the strongest color in the middle of the graph. That needs a twist in the color inversion curve. The next screenshot is from Krita where the curve is selected to affect Lightness:

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Curves+ is one of the free add-ons included in pyrochild effect collection. GIMP and Krita do not need any add-ons.

You may change red and blue to other colors by applying Hue/Saturation shifts. Some programs allow changing one color at a time. For ex. Photoshop has for it hue range limited Hue/Saturation adjustment. Paint.NET needs for the same a free add-on.

All bitmap image editors allow global hue and saturation adjustments. The next example of it is in Krita:

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"Nice" is subjective. Not sure what's wrong with the orange/green, but...

If you want to keep the red/blue, invert the image and then apply a Hue/Saturation adjustment to alter the color back to red/blue...

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I simply dragged the top slider to the left.

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