Color Visualization in Matlab Announcement: We do not have class in Wednesday (11/20) . You will work on the project III and bring questions to Friday’s class. In Friday’s class, we will schedule your presentation for choices either Monday (11/25) or Wednesday (11/27). Monday, 11/18/2002

Visualization of FEM Results Pixel: The smallest image-forming unit of a video display. Displacement field

Create a Figure Window figure(‘Position’,[left,bottom,width,height])

Example

Additive Color

RGB Color Model [red,green,blue] [0,1,0] [0,1,1] [1,1,1] [1,1,0] [0,0,1] [1,0,1] [1,0,0]

Color Cube

Example ny=60; nx=20; figure ('Position', [100, 100, ny, nx*3]); colormap([1 0 0; 0 1 0; 0 0 1]) imageMatrix = [ones(nx,ny) ones(nx,ny)*2 ones(nx,ny)*3]; image(imageMatrix) axis equal off ny Example nx

Hue-Saturation-Value colormap HSV is used in conjunction with colormap to specify a colormap which varies the hue component of the hue-saturation-value color model. The colors begin with red, pass through yellow, green, cyan, blue, magenta, and return to red. The map is particularly appropriate for displaying periodic functions.

HSV Color Example figure ('Position', [100, 100, 256, 50]); colormap(hsv(256)); imageMatrix = zeros(50,256); for ix=1:50 for iy=1:256 imageMatrix(ix,iy) = iy; end image(imageMatrix) axis equal off

Understanding Colormaps

Color Assignment

Mapping Rule

Visualization of FEM Results