how to convert 0-60 scale to 0-255 scale in image

I am new in imaging. I want to ask that when we convert certain data to image then a scale is always set to 0-60. How can I rescale it to 0-255 so that better contrast is observed.

Answer 1

[Image Analyst]

Use mat2gray() to get it to the range 0-1, then multiply by 255 and cast to unsigned integer:

grayImage = uint8(255 * mat2gray(originalImage));

[akash tondon]

Thanks for the reply but I know how to convert mat to gray. Problem is that when I give the command 'image(result)' again the scale of the image set itself to 0-60. I need scale from 0-250 as shown in figure

[Image Analyst]

It WON'T be 0-60. It WILL be 0-255. You did something wrong, so show me what you did. However if you want 0-250 instead of 0-255, do this:

grayImage = uint8(250 * mat2gray(originalImage));

Answer 2

[michio]

imadjust function from Image Processing Toolbox could help you.

See the example codes: http://www.mathworks.com/help/images/ref/imadjust.html

Answer 3

[Jan]

Another cheap approach:

result = uint8((double(originalImage) / 60) * 255);

mat2gray of Image Analysts answer is smarter and safer. Prefer the functions of the Image Processing Toolbox, if you have it.