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From gao yaoyao:
This is a utility to help visual impaired persons to detect simple objects in a image .You can use it to detect light sources ,big objects with different color to background,edges.Select a image from camera or photos album ,move a finger in the image view to pick color . The brightness component generates sound wav from 3000 Hz to 6000 Hz, from black to white. You will hear very sharp sound at color of light source or shinny metal..The saturation component generates sound wav from 1000 Hz to 2000Hz. You will hear warm sound at color of object not with black or white or gray color , like red car, blue sky ,green tree . The hue component generates sound wav from 1500 Hz to 3000 Hz . The application picks color from 17 pixels around your finger . You will hear something like morse code at edge of objects .