error using rgb2gray

image is in png format.

my code:

C= imread(rgb2gray(I));

error:

Error using rgb2gray>parse_inputs (line 80)

MAP must be a m x 3 array.

Error in rgb2gray (line 52)

isRGB = parse_inputs(X);

Error in DroseyeSvm (line 6)

C=imread(rgb2gray(B));

Answer 1

[Walter Roberson]

C = rgb2gray( imread(FileNameGoesHere));

Or if you already have an image array in I then just

C = rgb2gray(I);

[IP student ;(]

thank you