Abstract: An exemplary method for displaying bitmap with additional colors, includes: reading a bitmap and a first palette associated with the bitmap from a memory; dividing the bitmap into a color-unchanging portion and a color-changing portion; reading a second palette from the memory; associating the color-changing portion with the second palette; and displaying the color-unchanging portion using colors from the first palette and the color-changing portion using colors from the second palette.

Abstract: A focusing method for an image-capturing device with a focus is disclosed. The focusing method first determines a maximal contrast value and a corresponding first position of the focus by a focus procedure, and determines a second position of the focus by a calibration procedure. Next, the focusing method compares the first and second positions to generate an adjustment number of steps, and then positions the focus according to the adjustment number. By applying this method, the focus error problem of the image-capturing device can be improved, thereby upgrading the resolution and performance of the image-capturing device.