Cplot coloured blue3/24/2023 GetRGB ( Float_t & r, Float_t & g, Float_t & b) const Return pixel value corresponding to this color. GetHLS ( Float_t & h, Float_t & l, Float_t &s) const TColor ( Int_t color, Float_t r, Float_t g, Float_t b, const char * name="", Float_t a=1) TColor ( Float_t r, Float_t g, Float_t b, Float_t a=1) Remember to increase the number of contours for a smoother result, e.g.: gStyle->SetNumberContours(99) if you are drawing with "surf1z" or gStyle->SetNumberContours(256) if with "colz".Ĭolour Vision Deficiency (CVD) friendly palettes Unless it is symmetrical, then it is fine to have white in the borders and black in the centre (for example an axis that goes between -40 degrees and +40 degrees, the 0 has a meaning in the perceptualcolormap.C example).Ī full set of colour-vision deficiency friendly and perceptually uniform colour maps can be downloaded and used with ROOT (since 6.26) via: gStyle->SetPalette("filename.txt") or TColor::CreateColorTableFromFile("filename.txt"). The grayscale version of a palette should be as proportional as possible, and monotonously increasing or decreasing. Therefore the palettes are classified in two categories: those which are Colour Vision Deficiency friendly and those which are not.Īn easy way to classify the palettes is to turn them into grayscale using TCanvas::SetGrayscale(). Some others, like kAquamarine, have almost no contrast therefore it would be almost impossible (for a color blind person) to see something with a such palette. The kCMYK palette, is also not great because it's dark, then lighter, then half-dark again. Nat Com(2020) some color maps can visually distord data, specially for people with colour-vision deficiencies.įor instance one can immediately see the disadvantages of the Rainbow color map, which is misleading for colour-blinded people in a 2D plot (not so much in a 3D surfaces). The misuse of colour in science communication. As explained in Crameri, F., Shephard, G.E.
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