Processing image frames in different formats with reduced memory requirements in digital still cameras

A machine readable medium storing one or more sequences of instructions for enabling a digital still camera to process image frames, wherein execution of said one or more sequences of instructions by one or more processors contained in said system causes said system to perform the actions of:

• receiving a first plurality of pixel values representing an image frame in a first format;
• storing said first plurality of pixel values in a memory;
• forming a second plurality of pixel values representing said image frame in a second format by processing said first plurality of pixel values;
• and
• overwriting at least a part of said first plurality of pixel values in storing said second plurality of pixel values.

A digital still camera for processing image frames, said digital still camera comprising:

• a processor and a memory, wherein said processor is operable to:
• receive a first plurality of pixel values representing an image frame in a first format;
• store said first plurality of pixel values in said memory;
• form a second plurality of pixel values representing said image frame in a second format by processing said first plurality of pixel values;
• and
• overwrite at least a part of said first plurality of pixel values in storing said second plurality of pixel values.