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S kills : selecting colors, specifying colors in HTML

The RGB color model. S kills : selecting colors, specifying colors in HTML Concepts : combining red, green and blue light to generate colors, combining light versus combining paint, RGB color coding system.

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S kills : selecting colors, specifying colors in HTML

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  1. The RGB color model Skills: selecting colors, specifying colors in HTML Concepts: combining red, green and blue light to generate colors, combining light versus combining paint, RGB color coding system This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.

  2. Where does this topic fit? • Internet concepts • Applications • Technology • Implications • Internet skills • Application development • Content creation (Web) • User skills

  3. Pixel – geek for “dot” Mouse over the image to play the video (37 s)

  4. Why RGB? Cones – day vision, detect color Rods – night vision, high definition

  5. Different wavelengths, different colors

  6. Combine three primary colors for each pixel Intensities of each color can range from 0 - 255

  7. A few examples

  8. Experiment with color codes RGB demo program: http://som.csudh.edu/fac/lpress/netapps/color.exe

  9. Display sub-pixels What color would the part of the image surrounding the letter A be when viewed normally?

  10. Introduction to color theory

  11. http://colorschemedesigner.com/

  12. Grade school finger painting Why do all the colors add up to murky black?

  13. Mix light Mix pigment

  14. Paint.Net color selector and picker

  15. A large RGB display Millennium Park, Chicago

  16. Summary

  17. Optional stuff follows

  18. Podcast on color philosophy and physiology To what extent is color a physical thing in the physical world, and to what extent is it created in our minds?  http://www.radiolab.org/2012/may/21/

  19. HSV model • The outer edge of the top of the cone is the color wheel, with all the pure colors. The H parameter describes the angle around the wheel. • The S (saturation) is zero for any color on the axis of the cone; the center of the top circle is white. An increase in the value of S corresponds to a movement away from the axis. • The V (value or lightness) is zero for black. An increase in the value of V corresponds to a movement away from black and toward the top of the cone.

  20. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 13 24 25 Optional: counting in hexadecimal Decimal counting Hexadecimal counting … … 255 FF

  21. Optional: RGB colors in HTML #41FCDC R G B

  22. Self-study questions How many different colors are possible using the RGB model? What colors are the background and text on a page with this body tag: <body bgcolor = "#ffffff" text = "#000000" > What happens if you change the values of the bgcolor and textattributes of the body tag? Hexadecimal arithmetic – what is: 2F+1, 2F+9, 19+6, 19+7, 19+8, FF-1, 3D-8?

  23. Resources Cool color selector: http://www.ficml.org/jemimap/style/color/wheel.html Ten color matching tools: http://webdesignledger.com/tools/10-super-useful-tools-for-choosing-the-right-color-palette HTML built-in color names: http://www.w3schools.com/HTML/html_colornames.asp A second color model – specify hue, saturation and luminosity: http://www.labnol.org/home/hue-saturation-luminosity/20104/ Topic module on counting and number systems: http://cis275topics.blogspot.com/2010/11/counting.html

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