when i am using imshow(A,G) , i got Undefined function or variable 'G'. why so ?

i am using imshow(A,G), where A represent my image file matrix and G is the no. of intensity level used to display it as i read this in some book... but on running this function i am getting this answer Undefined function or variable 'G'. why so ?

Answer 1

[Image Analyst]

G would be a colormap - a pseudocolor look up table for yout indexed image. You did not set it to anything before you called imshow(), so why did you put it in there.? Replace it with [] and see if that works for you.

[chitresh]

thank you about the answer, but i know that thing[] i.e. imshow(a,[]); this is working and this is also imshow(a); but this commant is not running its mention in the book that imshow(a,G); where a is the image array and G is no. of intensity level used to display it. but it show undefined funtion of variable 'g'... similarly when i am using another command b = imshow(a,[low high]) i am getting >> b = imshow(a,[low high]); Undefined function or variable 'low'.

Did you mean: >> b = imshow(a,[llow hhigh]); Error using llow (line 39) Invalid number of arguments.

[Image Analyst]

You can use imshow(grayImage, [0 255]) if you want, or imshow(indexedImage, gray(256)) also. Or just define G yourself as a 256 by 3 array of numbers in the range 0-1, like

G = gray(256);