1/31/2024 0 Comments Wizard book palette![]() This writing has examined how to work with the freely accessible HCL Wizard tool to select Color Schemes for your data visualization. It is fascinating how these three different approaches to Color Scheme Selection can yield similar results. Three-Way Comparison of a Magenta-Green Color Harmony in RGB Space, a Pink Yellow Green Diverging Color Scheme from ColorBrewer and the Red-Green Scheme from HCL Wizard. Coblis allows for importing an actual image into it color deficiency simulator while HCL Wizard shows color deficiencies of its provided “Examples.” Later, I will use the Color Blindness Simulation (Coblis) tool to assess color deficiencies in the final colorized visualization. I can select each of these “Vision” options to evaluate the appearance of the Orange - Green prototype under these Color Deficiencies. A Blue cone deficiency is classified as Tritanopia. A Red cone deficiency is classified as Protanopia. If one or more of the set of cones does not perform properly, a color deficiency results.Ī Green cone deficiency is classified as Deuteranopia. These three different photoreceptor cone cells combine to facilitate rich color vision. ![]() As highlighted in my previous writings on color in data visualization, in humans there are three types of photoreceptors or cones where each is sensitive to different parts of the visual spectrum of light. HCL Wizard includes options for exploring Color Deficiencies. Exploring the Vision (Color Deficiency) Options Using the Control Options to Reverse the Color Scheme to Orange - Green. In data visualization, these contrasts can be mistaken as changes in the data rather than as transitions in the color palette. A non-uniform perceptual colormap can have stark contrasts when transitioning from one hue to another. The standard rainbow colormap and the traditional Red Green Blue (RGB) Color Space are non-uniform. Perceptual UniformityĪ color space is perceptually uniform if a change of length in any direction of the color space is perceived by a human as the same change. So, let’s get started with a review of the concept of perceptual uniformity. I also note these similarities and slight differences in this writing. Coblis allows for importing an actual image into its color deficiency simulator while HCL Wizard shows color deficiencies of its provided “Examples”.Īfter the selected color scheme is applied to my Likert based data visualization, my final advanced diverging color scheme turns out to be similar to a complementary color harmony that can be created with Adobe Color and a diverging color scheme from ColorBrewer. Later, I use the Color Blindness Simulation (Coblis) tool to assess color deficiencies in the actual colorized visualization. I show how to recover from this difficulty using HCL Wizard. This happens to me in my first color scheme selection. Here, I use an ordinal data example based on the Likert scale of strongly agree, agree, neutral, disagree or strongly disagree to show how HCL Wizard helps you colorize.Ī perceptual uniform color scheme might not pass color deficiency tests. HCL Wizard is a perceptually uniform color selection tool based on the Hue Chroma Luminance (HCL) color model that I discussed in a previous writing on “Color in a Perceptual Uniform Way”. ![]() In this writing, I discuss how to build a Color Scheme for your data visualization with the freely accessible web app called HCL Wizard.
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