change Red level in RGB

I got these code but it keeps saying that im have not enough input arguments. or,it said undefined function or variable while i put the picture name and format

function S=newRGB(fname, fformat, Rlevel, Glevel, Blevel) X=imread(fname, fformat); X=double(X); X=X/255; S=size(X); X(:,:,1)=X(:,:,1)* (Rlevel/100); X(:,:,2)=X(:,:,2)* (Glevel/100); X(:,:,3)=X(:,:,3)* (Blevel/100); figure; image(X); axis off end

[Michael Haderlein]

Can you please format your question in a readable manner (there is a code button top of the text box you're writing your question in) and also tell us how you run this function (what you type into the command window)? Also, you write that you get two different error messages - when do you get which?

[jarvan]

function S=newRGB(fname, fformat, Rlevel, Glevel, Blevel) 
X=imread(fname, fformat); 
X=double(X); 
X=X/255; 
S=size(X); 
X(:,:,1)=X(:,:,1)* (Rlevel/100); 
X(:,:,2)=X(:,:,2)* (Glevel/100);
X(:,:,3)=X(:,:,3)* (Blevel/100); 
figure; 
image(X); 
axis off 
end

 for example i have flower.jpg
 i hit newRGB(flower,jpg,50,100,100)
 it said Undefined function or variable 'flower'.

Answer 1

[Geoff Hayes]

jarvan - you are passing flower and jpg into your function as if they are variables rather than strings. Since you have not defined a variable as flower then the error message makes sense. If you use the signature that you have defined for newRGB then execute the following in the Command Window instead

 newRGB('flower','jpg',50,100,100);

Note how strings are now being passed into this function.

Or, you could just simplify your function and pass the file name and extension together. Change the first two lines of newRGB to

 function S=newRGB(fname, Rlevel, Glevel, Blevel) 
 X=imread(fname);

In the above, we have removed the format (extension) string. Now you can just execute the following

 newRGB('flower.jpg',50,100,100);

[jarvan]

thank you for you response. it works for me now