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HSV colour model

HSV colour model. Primary colours Red Green Blue Secondary Cyan Magenta Yellow Secondary=White-Primary (create colors for print). Source: http://www.ncsu.edu/scivis/lessons/colormodels/color_models2.html. HSV colour model, tertiary colours. Add the colours between primary

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HSV colour model

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  1. HSV colour model Primary colours Red Green Blue Secondary Cyan Magenta Yellow Secondary=White-Primary (create colors for print) Source: http://www.ncsu.edu/scivis/lessons/colormodels/color_models2.html

  2. HSV colour model, tertiary colours Add the colours between primary and secondary

  3. HSV colour model • Colour specified by 3 parameters: • hue (angle on disc) • saturation (how dominant is the hue relative to the other colours) • value (overall intensity of the light)

  4. HSV colour model

  5. Colour = sensation. It is determined by: • Light • Physiology • Psychology Experiment

  6. Read the colors of the words in col 1, then col 3, then col 2:

  7. Experiments with optical illusions: http://www.michaelbach.de/ot/col_lilacChaser/index.html

  8. Capturing images (with digital camera…) Charge motion Charge motion Image area (exposed to light) Parallel (vertical) registers Pixel Serial (horizontal) register Output amplifier masked area (not exposed to light) (slides by Claudio Cumani, European Southern Observatory) 9

  9. Representing the intensity of a primary color (eg. Red) • left: 3 bits per color (numbers 0 to 7) • right: 8 bits per color (numbers 0 to 255)

  10. Lossless compression • original x by y pixels • stored: the color of every pixel, row by row

  11. Lossless compression • original x by y pixels • stored: the color of every pixel, row by row • A lot of black pixels! • (R,G,B=0,0,0) • Replace sequence of black pixels by 2 numbers: • “0, n” • n - nr repetitions.

  12. Image from a digital camera (10MB) stored as 128kB

  13. JPEG compression 8x8 blocks of pixels

  14. <- 1 block.

  15. We can store the average value for every block

  16. What if we stored the average for 4x4 blocks?

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