In one embodiment, a digital still camera includes: an image sensor for receiving light and generating output signals representative of an image of an object or a scene of interest; a processing circuit connected to the image sensor for processing the output signals from the image sensor; and a control circuit connected to the processing circuit for successively generating a plurality of image files and for determining a remaining picture count after each image file is generated based on one of a plurality of predetermined decrement numbers corresponding to an actual image file size of each image file.