Question

I have a text file containing RGB data for an image, how can I draw the image using this data in matlab?

data sample :

Red Green Blue
80 97 117
83 100 120
74 91 111
81 96 115
81 96 115
77 90 107
84 97 114
78 91 108
79 95 110
91 104 120
94 108 121
85 99 112

Answer 1

The IMAGE command takes an MxNx3 matrix and displays it as an RGB image. You can use LOAD and RESHAPE to get the data into the right format. Finally, IMAGE wants either integers between 0 and 255 or doubles between 0 and 1.0, so you need to cast or rescale your numbers. The following code snippet should show you how to put it all together.

x = load('rgbdata.txt'); % makes a 12x3 matrix
x = reshape(x, 2, 6, 3); % reshape pulls columnwise, assume 6x2 image
x = x/255; %scale the data to be between 0 and 1
image(x);