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Vivid light anomaly ?


ch22

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Hello

I am currently writing tutorials about blending modes (for instance, see http://www.oitregor.com/numeric/affinity_photo/ouvre2_tutoAP.html?8e —french only, sorry) and I met up against odd behaviour with vivid light mode. Roughly speaking, duplicating a layer, inverting the copy and putting it in vivid light mode should result into a 50% grey display, except possibly for black pixels which lead to a division by 0 —unless Affinity Photo does not follow the common formulae for this mode. 

I tried the experiment with the following picture 

vivid_light_anomaly.jpg.463a0801364f3086d32b6be9764aee04.jpg

Il is made of two gradients, the upper one involving mid-range tones, neither too clear nor too dark while the lower gradient involves darker tones, near black, but not only pure black. After the process (duplicating, inverting, vivid light mode) I obtained tones far from the expected 50% grey for the lower gradient, as shown below : 

result.jpg.db87091eb648a5d8c807a582a772cf01.jpg  

Same result in MacOS and Windows. Any explanation, if any ?  

Thank you

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