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The BYTSCL rescales your output from -1 to 1 -> 0 to 255. Remove that last bit, and you don't have your problem. BYTSCL is usually used for minimizing storage and bandwidth requirements associated with displaying data online. If you want to make sure that you do not have values below -1 and above 1, you can use this function: (float(b1) lt ...


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fiducial mark are used to define the coordinate system of the photograph. With film photograph, the paper moves under the objective and can get further distorted during storage and development, so you need to localise the image on each frame. On the other hand, digital sensors are fixed, so you don't need any mark on the image to define the coordinate ...



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