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Also , depending on what you are trying to do , you could ask for the entire image , but blown down by some factor . A problem encountered when using graphic formats such as GIF or PCX to store spectrum data is that , in order to access a particular part of an image , the entire image must be decompressed . I probably would n't , however , try to read in the entire image , but , then again , I do n't know exactly what you are trying to do with the data . So you cannot see the entire image . When the field lens is inserted , light illuminating the entire image is kept within a small enough angle that it passes through the lens system .