FreeMat: IMAGESC Image Display Function

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IMAGESC Image Display Function

Section: Handle-Based Graphics

# Usage

The `imagesc` command has the following general syntax

      handle = imagesc(x,y,C,clim)

where `x` is a two vector containing the `x` coordinates of the first and last pixels along a column, and `y` is a two vector containing the `y` coordinates of the first and last pixels along a row. The matrix `C` constitutes the image data. It must either be a scalar matrix, in which case the image is colormapped using the `colormap` for the current figure. If the matrix is `M x N x 3`, then `C` is intepreted as RGB data, and the image is not colormapped. The `clim` argument is a pairs [low high] that specifies scaling. You can also omit the `x` and `y`,

      handle = imagesc(C, clim)

in which case they default to `x = [1,size(C,2)]` and `y = [1,size(C,1)]`. Finally, you can use the `image` function with only formal arguments

      handle = imagesc(properties...)

# Example

In this example, we create an image that is `512 x 512` pixels square, and set the background to a noise pattern. We set the central `128 x 256` pixels to be white.

    --> x = rand(512);
    --> x((-64:63)+256,(-128:127)+256) = 1.0;
    --> figure

    ans =
     1

    --> imagesc(x,[0 .5])
    --> colormap(gray)