PSYC 4365 Lecture Notes - Lecture 16: Ewald Hering, Afterimage, Visual Cortex
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Step 3: color appearance: color space: a three-dimensional space that describes all colors. Rgb color space: defined by the outputs of long, medium, and short wavelength lights. Hsb color space: defined by hue, saturation, and brightness. Brightness: the distance from black in color space. Figure 5. 12 a color picker may offer several ways to specify a color in a 3-dimensional color space. Some lgn cells are excited by l-cone onset in center, inhibited by m-cone onsets in their surround (and vice-versa) Other cells are excited by s-cone onset in center, inhibited by (l + m)-cone onsets in their surround (and vice-versa) Blue versus yellow: ewald hering (1834 1918) noticed that some color combinations are legal while others are illegal. We can have bluish green, reddish yellow (orange), or bluish red (purple) We cannot have reddish green or bluish yellow. Figure 5. 14 hering"s idea of opponent colors: hue cancellation experiments. Start with a color, such as yellowish green.
