![]() ![]() The process was described in this post, and you can see an animation of the spiral curve in CIELab space (created with the 3D color inspector plugin in ImageJ) in the video below: My first attempt of colormap spiralling in CIELab, CubicYF, came to life by selecting hand-picked colours on CIELab colour charts at fixed lightness values (found in this document by Gernot Hoffmann). ![]() I found this not only fascinating – a three-dimensional, perceptual colorspace from the 13th century!! – but also a source of renewed interest in creating the perfect perceptual colormaps by spiralling through CIELab. The authors were able to model this colorspace and also to show that the locus of rainbow colours generated in that colorspace forms a spiral surface (a family of spiral curves, each form a specific rainbow) in the perceptual CIELab colorspace. (who also recently published a new critical edition/translation of the treatise with analysis and critical commentaries) analyze the 3D colorspace devised by Grosseteste, who claimed it allows the generation of all possible colours and to describe the variations of colours among different rainbows.Īs we learn from Smithson et al., Grosseteste’s colorpsace had three dimensions, quantified by physical properties of the incident light and the medium: these are the scattering angle (which produces variation of hue within a rainbow), the purity of the scattering medium (which produces variation between different rainbows and is linked to the size of the water droplets in the rainbow), and the altitude of the sun (which produces variation in the light incident on a rainbow). In a recent commentary on Nature Physics ( All the colours of the rainbow), and reference therein ( A three-dimensional color space from the 13th century), Smithson et al. The Bishops’ interests and investigations covered diverse topics, making him a pre-renaissance polymath however, it is his 1225 treatise on colour, the De Colore, that is receiving much attention. In the article I learned for the first time of Robert Grosseteste, a 13th century British scholar (with an interesting Italian last name: Grosse teste = big heads) who was also the Bishop of Lincoln. Plt.The other day I stumbled into an interesting article on The Guardian online: The medieval bishop who helped to unweave the rainbow. ![]() Python Examples Python Examples Python Compiler Python Exercises Python Quiz Python Bootcamp Python Certificate Python How To Remove List Duplicates Reverse a String Add Two Numbers Module Reference Random Module Requests Module Statistics Module Math Module cMath Module ![]() Python Reference Python Overview Python Built-in Functions Python String Methods Python List Methods Python Dictionary Methods Python Tuple Methods Python Set Methods Python File Methods Python Keywords Python Exceptions Python Glossary Python MongoDB MongoDB Get Started MongoDB Create Database MongoDB Create Collection MongoDB Insert MongoDB Find MongoDB Query MongoDB Sort MongoDB Delete MongoDB Drop Collection MongoDB Update MongoDB Limit Python MySQL MySQL Get Started MySQL Create Database MySQL Create Table MySQL Insert MySQL Select MySQL Where MySQL Order By MySQL Delete MySQL Drop Table MySQL Update MySQL Limit MySQL Join Machine Learning Getting Started Mean Median Mode Standard Deviation Percentile Data Distribution Normal Data Distribution Scatter Plot Linear Regression Polynomial Regression Multiple Regression Scale Train/Test Decision Tree Confusion Matrix Hierarchical Clustering Logistic Regression Grid Search Categorical Data K-means Bootstrap Aggregation Cross Validation AUC - ROC Curve K-nearest neighbors Python Matplotlib Matplotlib Intro Matplotlib Get Started Matplotlib Pyplot Matplotlib Plotting Matplotlib Markers Matplotlib Line Matplotlib Labels Matplotlib Grid Matplotlib Subplot Matplotlib Scatter Matplotlib Bars Matplotlib Histograms Matplotlib Pie Charts Python Modules NumPy Tutorial Pandas Tutorial SciPy Tutorial Django Tutorial Python Dictionaries Access Items Change Items Add Items Remove Items Loop Dictionaries Copy Dictionaries Nested Dictionaries Dictionary Methods Dictionary Exercise Python If.Else Python While Loops Python For Loops Python Functions Python Lambda Python Arrays Python Classes/Objects Python Inheritance Python Iterators Python Polymorphism Python Scope Python Modules Python Dates Python Math Python JSON Python RegEx Python PIP Python Try.Except Python User Input Python String Formattingįile Handling Python File Handling Python Read Files Python Write/Create Files Python Delete Files ![]()
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