How to transfer a matrix into an image correctly?

Hi everyone,

I have a trouble converting 3-dimensional matrices into color images. I used the function imwrite(). However it just converted a lot of my entries with small values (like 7.003) into 254 or 255. This is highly undesirable for my project. Is there a way to deal with it?

Thanks, Jack

Answer 1

[Walter Roberson]

You should proceed one of two ways:

1. If your values are in the range 0 to 255 and fractions do not matter to you, then uint8() the data before imwrite()
2. use mat2gray() to convert your data into the range 0 to 1, and then im2uint8() or im2uint16() that and imwrite what comes out.

[Jack Z]

Thank. I used method one about 4 hours ago and solved the problem.