R: Show a colormap with multiple images

pal.test {pals} | R Documentation

## Show a colormap with multiple images

### Description

1. Z-curve

### Usage

    pal.test(pal, main = substitute(pal))

### Arguments

`pal` | A palette function or a vector of colors.
`main` | Title to display at the top of the test image

### Details

2. Contrast Sensitivity Function.

3. Frequency ramp. See: http://inversed.ru/Blog_2.htm Are the vertical bands visible across the full vertical axis?

4. 5. Two images of the 'volcano' elevation data in R using forward/reverse colors. Try to find the highest point on the volcano peak. Many palettes with dark colors at one end of the palette hide the peak (e.g. viridis). Also try to decide if the upperleft and upperright corners are the same color.

6. Luminosity in red, green, blue, and grey.

### Value

None.

### Author(s)

Kevin Wright

### References

# See links above.

### Examples

    pal.test(parula)
    pal.test(viridis) # dark colors are poor
    pal.test(coolwarm)

[Package pals version 1.5 Index]