It was very straignt forward except that I didn't know what portion of edge I had to chop off.
I didn't have a big images being taken with RGB filters. Therefore I used same image I used for (a).
This question is very vague, I think. If we want to do that auto adjustment only with our camera, we will have tighter limit than when we use our computer. If we want to do auto adjustment using only a camera, the best way I can think of is that put a certain object whenever we take a picture. And we put the imformation about that object into the camera. That way, when we calculate the contrast and all that, since we know that how much adjustment we need by comparing between the information of certain object and the object from that picture. If we can use our computer, then I think many sample could help us better. comparing many samples so we can figure out the degree of color or brightness what it supposed to be. For example, when we took a picture of a mountain, we can adjust our picture by compairing among our data.