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In the film era the bleach bypass method of processing colour film (as the technique suggests) skipped the bleaching phase. Bleaching removes the silver content from the emulsion, therefore bypassing it caused the silver to remain. This resulted in an image with reduced saturation but increased grain and contrast. The result can be achieved digitally and far more simply – many image manipulation software packages provide a filter that mimics the process, although time should be spent adjusting various levels to produce a satisfactory result…and not all types of images are suitable for this treatment.