How to invert intensity values of a scalar frame?

WKT ,each pixel has a value from 0 (black) to 255 (white)...But i need 255(white) and 0(black)..So any suggestions to change pixel values like this...

Answer 1

[Geoff Hayes]

Vignesh - if the data type of each pixel in your image is an 8-bit unsigned integer, then just subtract these pixels from 255. For example,

 myImg = uint8([zeros(400,200,3) 255*ones(400,200,3)]);
 image(myImg);

will create a square image that is black on the left half and white on the right. If we then do,

 image(uint8(255)-myImg);

then the left-half of the image is now white and the right-half is white, and so we have changed the pixels from 0 to 255 and 255 to 0.

Try the above and see what happens!