The can pinhole uses photosensitive paper to capture the image, requiring longer exposures than pinholes that use photographic film. Because it is based on the darkroom principle, the image is inverted in three ways: vertically, horizontally, and color (negative). While for vertical and horizontal inversion it is only necessary to rotate the paper, for the color change it is necessary to convert by photocontact process or by computer programs that invert the colors of the image in the digital media.