This is my original image of the outside of the college my exposure time was about one minute and the picture was slightly over exposed and next time i would reduce my exposure time . 
The second image is the same image but this one has been inverted to positive and i have played with the contrast a bit.
Michael your images are a good example of the unpredictability of the pinhole process..!! Despite knowing what 'should' happen, it rarely does. However your posts demonstrate your understanding of the principles involved in producing photographic images.
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