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Color Perception of color Color spaces

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Presentation on theme: "Color Perception of color Color spaces"— Presentation transcript:

1 Color Perception of color Color spaces
Three cones sensitive to “red”, “green”, and “blue” Overlapping response curves Color spaces , ,  space vs. R, G, B space vs. X, Y, Z space, 3x3 matrices to convert between them Gamut, chromaticity diagrams

2 Color Combining colors Intuitive colorspaces
Additive vs. subtractive mixing Primaries Intuitive colorspaces Single and double cones, hexcones HSL, HSV When are these useful? When is RGB preferable?

3 Color Sample questions:
What are ideal spectra for primaries used in additive mixing? Why? The point (255, 127, 127) in RGB space is nearest to what point in single-hexcone HSV space? The gamut of a typical CRT, when drawn on a chromaticity diagram, does not intersect the locus of spectral colors. Why not?

4 Sampling and Antialiasing
The sampling and reconstruction pipeline: Prefiltering Sampling Resampling Reconstruction Fourier transform, aliasing in the frequency domain Filtering and convolution

5 Sampling and Antialiasing
Prefiltering vs. postfiltering Desirable filters for antialiasing Supersampling Regular vs. stochastic Unweighted/weighted area sampling Why is this an approximation?

6 Sampling and Antialiasing
Sample questions: Which of the following would affect your choice of a reconstruction filter? Pixel shape Choice of prefilter Actual size of the display What is the result of convolving a 1-D box filter with itself?


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