approx.scotopic.luminance.LarsonEtAl.RGB: Approximation of the scotopic luminance

In CVD: Color Vision Deficiencies

Description

approx.scotopic.luminance.LarsonEtAl.RGB approximates the scotopic luminance from RGB values. approx.scotopic.luminance.LarsonEtAl.XYZ approximates the scotopic luminance from XYZ values.

Usage

approx.scotopic.luminance.LarsonEtAl.XYZ(XYZmatrix)
approx.scotopic.luminance.LarsonEtAl.RGB(RGBmatrix)

Arguments

XYZmatrix	matrix with XYZ values
RGBmatrix	matrix with RGB values

Value

approximated scotopic luminance

Author(s)

Jose Gama

Source

Larson, G. W., H. Rushmeier, and C. Piatko (1997, October - December). A visibility matching tone reproduction operator for high dynamic range scenes. IEEE Transactions on Visualization and Computer Graphics 3 (4), 291–306.

References

Larson, G. W., H. Rushmeier, and C. Piatko (1997, October - December). A visibility matching tone reproduction operator for high dynamic range scenes. IEEE Transactions on Visualization and Computer Graphics 3 (4), 291–306.

Examples

## Not run: 
samplePics <- c('fruits', 'pastel_color', 'sample1', 'TurnColorsGrayImage1', 'TurnColorsGrayImage2')
for (pics in samplePics)
{
fname<-paste(system.file(package='CVD'),'/extdata/',pics,'.png',sep='')
imgTest<-loadPNG(fname)
imgTest.array<-approx.scotopic.luminance.LarsonEtAl.RGB.array(imgTest)
png::writePNG(imgTest.array, paste(pics, '.approx.scotopic.luminance.LarsonEtAl.RGB.png',sep=''))
}

## End(Not run)

Example output

[1] "PNG 602x1002, 3 channels."
[1] "PNG 186x180, 3 channels."
[1] "PNG 361x480, 3 channels."
[1] "PNG 300x300, 3 channels."
[1] "PNG 301x302, 3 channels."

CVD documentation built on May 2, 2019, 6:30 p.m.