Interpolated shading, which is also known as Gouraud shading, is

piecewise bilinear; the Color in each segment or patch varies linearly

and interpolates the end or corner values.

Faceted shading is flat shading with superimposed black mesh lines.

This is often the most effective and is the default.

SHADING(AX,...) uses axes AX instead of the current axes.

SHADING is a MATLAB file that sets the EdgeColor and FaceColor properties

of all SURFACE objects in the current axes. It sets them to the

correct values that depend upon whether the SURFACE objects are

representing meshes or surfaces.

See also hidden, surf, mesh, pcolor, fill, fill3, surface, patch.

Reference page in Help browser

doc shading

<hidden> - Mesh hidden line removal mode.

HIDDEN Mesh hidden line removal mode.

HIDDEN ON sets hidden line removal on for meshes in the current axes.

HIDDEN OFF sets hidden line removal off so you can see through

meshes in the current axes.

HIDDEN by itself toggles the state of hidden line removal.

See also mesh.

Reference page in Help browser

doc hidden

<brighten> - Brighten or darken color map.

BRIGHTEN Brighten or darken color map.

BRIGHTEN(BETA) replaces the current color map with a brighter

or darker map involving essentially the same colors. The map is

brighter if 0 < BETA <= 1 and darker if -1 <= BETA < 0.

BRIGHTEN(BETA), followed by BRIGHTEN(-BETA) restores the

original map.

MAP = BRIGHTEN(BETA) returns a brighter or darker version of the

color map currently being used without changing the display.

NEWMAP = BRIGHTEN(MAP,BETA) returns a brighter or darker version

of the specified color map without changing the display.

BRIGHTEN(FIG,BETA) brightens all the objects in the figure FIG.

Reference page in Help browser

doc brighten

<colordef> - Set color defaults.

COLORDEF Set color defaults.

COLORDEF WHITE or COLORDEF BLACK changes the color defaults on the

root so that subsequent figures produce plots with a white or

black axes background color. The figure background color is

changed to be a shade of gray and many other defaults are changed

so that there will be adequate contrast for most plots.

COLORDEF NONE will set the defaults to their MATLAB 4 values.

The most noticeable difference is that the axis background is set

to 'none' so that the axis background and figure background colors

are the same. The figure background color is set to black.

COLORDEF(FIG,OPTION) changes the defaults of the figure FIG

based on OPTION. OPTION can be 'white','black', or 'none'.

The figure must be cleared first (via CLF) before using this

Variant of colordef.

H = COLORDEF('new',OPTION) returns a handle to a new figure

created with the specified default OPTION. This form of the

command is handy in GUI's where you may want to control the

default environment. The figure is created with 'visible','off'

to prevent flashing.

See also whitebg.

Reference page in Help browser

doc colordef

<graymon> - Set graphics defaults for gray-scale monitors.

GRAYMON Set graphics defaults for gray-scale monitors.

GRAYMON changes the default graphics properties to produce

legible displays for gray-scale monitors.

Reference page in Help browser

doc graymon

<cmpermute> - Rearrange colors in colormap.

CMPERMUTE Rearrange colors in colormap.

[Y,NEWMAP] = CMPERMUTE(X,MAP) randomly reorders the colors in

MAP to produce a new colormap NEWMAP. CMPERMUTE also

modifies the values in X to maintain correspondence between

the indices and the colormap, and returns the result in

Y. The image Y and associated colormap NEWMAP produce the

same image as X and MAP.

[Y,NEWMAP] = CMPERMUTE(X,MAP,INDEX) uses an ordering matrix

(such as the second output of SORT) to define the order of

colors in the new colormap.

For example, to order a colormap by luminance, use:

ntsc = rgb2ntsc(map);

[dum,index] = sort(ntsc(:,1));

[Y,newmap] = cmpermute(X,map,index);

Class Support

-------------

The input image X can be of class uint8 or double. Y is

returned as an array of the same class as X.

Example

-------

This example orders a colormap by value.

load clown

hsvmap = rgb2hsv(map)

[dum,index] = sort(hsvmap(:,3));

[Y,newmap] = cmpermute(X,map,index);

figure, image(X), colormap(map)

figure, image(Y), colormap(newmap)

See also randperm, sort.

Reference page in Help browser

doc cmpermute

<cmunique> - Eliminate unneeded colors in colormap of indexed image.

CMUNIQUE Eliminate unneeded colors in colormap of indexed image.

[Y,NEWMAP] = CMUNIQUE(X,MAP) returns the indexed image Y and

associated colormap NEWMAP that produce the same image as

(X,MAP) but with the smallest possible colormap. CMUNIQUE

removes duplicate rows from the colormap and adjusts the

indices in the image matrix accordingly.

[Y,NEWMAP] = CMUNIQUE(RGB) converts the truecolor image RGB

to the indexed image Y and its associated colormap

NEWMAP. NEWMAP is the smallest possible colormap for the

image, containing one entry for each unique color in

RGB. (Note that NEWMAP may be very large, as much as P-by-3

where P is the number of pixels in RGB.)

[Y,NEWMAP] = CMUNIQUE(I) converts the intensity image I to an

indexed image Y and its associated colormap NEWMAP. NEWMAP is

the smallest possible colormap for the image, containing one

entry for each unique intensity level in I.

Class Support

-------------

The input image can be of class uint8, uint16, or double.

The class of the output image Y is uint8 if the length of

NEWMAP is less than or equal to 256. If the length of

NEWMAP is greater than 256, Y is of class double.

Example

-------

X = magic(4);

map = [gray(8); gray(8)];

[Y, newmap] = cmunique(X, map);

figure, image(X), colormap(map)

figure, image(Y), colormap(newmap)

See also rgb2ind.

Reference page in Help browser

doc cmunique

<imapprox> - Approximate indexed image by one with fewer colors.

IMAPPROX Approximate indexed image by one with fewer colors.

[Y,NEWMAP] = IMAPPROX(X,MAP,N) approximates the colors in the

indexed image X and associated colormap MAP by using minimum

variance quantization. IMAPPROX returns indexed image Y with

colormap NEWMAP, which has at most N colors.

[Y,NEWMAP] = IMAPPROX(X,MAP,TOL) approximates the colors in X

and MAP through uniform quantization. NEWMAP contains at most

(FLOOR(1/TOL)+1)^3 colors. TOL must be between 0 and 1.0.

Y = IMAPPROX(X,MAP,NEWMAP) approximates the colors in MAP by

using colormap mapping to find the colors in NEWMAP that best

match the colors in MAP.

Y = IMAPPROX(...,DITHER_OPTION) enables or disables

dithering. DITHER_OPTION is a string that can have one of

these values:

'dither' dithers, if necessary, to achieve better color

resolution at the expense of spatial

resolution (default)

'nodither' maps each color in the original image to the

closest color in the new map. No dithering is

performed.

Class Support

-------------

The input image X can be of class uint8, uint16, or double.

The output image Y is of class uint8 if the length of NEWMAP