EDIT: It says "Anonymous4" as the OP, but I just joined and my real username is SealBoi. Just keep that in mind so you know who I am when I comment on something.
I was using MS Paint to draw onto a photograph, and I've drawn a closed shape. I selected the colour I wanted to fill the shape with (as colour 1), and then I clicked on the fill with colour icon (not the other fill for shapes).
Now, it shows the bucket icon (with black paint coming out of it when black is not the colour I selected - is that of any significance?), but when I click inside the shape, nothing happens.
Upon magnifying the image, I can see the problem. Every time I click with the bucket, it fills one pixel with the desired colour. That's because the image I'm drawing onto is a photograph and due to lighting each pixel is a different colour.
Is there any solution to this? Can I change the background all to one colour? Is there any way of setting everything in the picture except what I draw to just white?