Variance maps should not be confused with ______, which contain some green adjacent to the blue color.

Variance maps should not be confused with ______, which contain some green adjacent to the blue color.

• A. Rainbow maps
• B. Variance maps
• C. Color maps
• D. Gray maps

Answer: (A)

Color ramps that are designed to represent data should be chosen for how smoothly they map values to perception. Rainbow maps use a spectrum that runs through blue into green and beyond, so you often see green appear right next to blue on the ramp. This adjacency is a hallmark of rainbow color maps and is the reason they’re being contrasted here. Variance maps convey how much a quantity varies, not the exact value itself, and they benefit from color schemes that keep perceptual steps consistent. Because rainbow ramps can exaggerate or obscure small differences around the blue–green area, they’re not the best choice for showing variability. That’s why the item points to rainbow maps as the thing not to confuse variance maps with. Other color schemes, like grayscale or perceptually uniform ramps, avoid that blue–green adjacency and provide a clearer sense of differences in variance.

Color ramps that are designed to represent data should be chosen for how smoothly they map values to perception. Rainbow maps use a spectrum that runs through blue into green and beyond, so you often see green appear right next to blue on the ramp. This adjacency is a hallmark of rainbow color maps and is the reason they’re being contrasted here.

Variance maps convey how much a quantity varies, not the exact value itself, and they benefit from color schemes that keep perceptual steps consistent. Because rainbow ramps can exaggerate or obscure small differences around the blue–green area, they’re not the best choice for showing variability. That’s why the item points to rainbow maps as the thing not to confuse variance maps with.

Other color schemes, like grayscale or perceptually uniform ramps, avoid that blue–green adjacency and provide a clearer sense of differences in variance.