How to replace image pixels

I have an image and a csv file. I want to change the pixel value of the image to the values in the csv file. How do I do that?

[Adam]

Load the image, load the csv file, index into the image and replace values. Write the image to file again if desired.

Answer 1

[Image Analyst]

Try this if your data is stored row, column, new gray level:

data = csvread(filename);  % Assumes columns of row, column, new gray level, NOT x, y, new gray level
rows = data(:, 1);
columns = data(:, 2);
newValues = data(:, 3);
for k = 1 : length(rows)
    grayImage(rows(k), columns(k)) = newValues(k); % Replace this pixel of grayImage with a new value.
end

If your data is in the form x, y, gray level, you need to do this:

data = csvread(filename);  % Assumes columns of x, y, new gray level, NOT row, column, new gray level
rows = data(:, 2);
columns = data(:, 1);
newValues = data(:, 3);
for k = 1 : length(rows)
    grayImage(rows(k), columns(k)) = newValues(k); % Replace this pixel of grayImage with a new value.
end