rgb2lab

img = rgb2lab(I::GMTimage{UInt8, 3})

or

    L, a, b = rgb2lab(I::GMTimage{UInt8, 3}, L=false, a=false, b=false)

Convert RGB to CIE 1976 Lab*

Optionally, return only one to three of: L, a* and b* separate images. For that use the keywords: L, a or b. Each true occurence makes it return that component, otherwise it returns an empty image.

Args

• I::GMTimage{UInt8, 3}: input RGB image.

Kwargs

• L: If true return the L component.

• a: If true return the a component.

• b: If true return the b component.

Returns

A RGB GMTimage or up to three GMTimages grayscales images with the L, a* and b* components.

Example

using GMT

# Read an RGB image and compute the Lab transform.
I = gmtread(GMT.TESTSDIR * "assets/seis_section_rgb.jpg");
Ilab = rgb2lab(I);

# The L, a* and b* components
L,a,b = rgb2lab(I, L=true, a=true, b=true);

# Show the five.
grdimage(I, figsize=8)
grdimage!(Ilab, figsize=8, yshift=-3.8)
grdimage!(L, figsize=8, yshift=-3.8)
grdimage!(a, figsize=8, yshift=-3.8)
grdimage!(b, figsize=8, yshift=-3.8, show=true)

See Also