Method and apparatus for encoding/decoding color image

A video encoding method comprising:

• decomposing a current block of an image into a luminance component block and a chrominance component block;
• encoding the luminance component block;
• performing a selection of one color format among a plurality of color formats;
• encoding a chrominance component block according to the one color format upon selection;
• and
• generating and outputting a bitstream including the luminance component block upon encoding, the chrominance component block upon encoding, and information on the color format upon selection.

A video decoding apparatus comprising:

• a bitstream decomposer for extracting information on an encoded luminance component block, an encoded chrominance component block, and a color format from a bitstream;
• a luminance component decoder for decoding the encoded luminance component block to reconstruct a current block of a luminance component;
• and
• a chrominance component decoder for decoding the encoded chrominance component block in the color format according to the information on the color format to reconstruct the current block of a chrominance component.

A video decoding method comprising:

• decomposing a bitstream by extracting information on an encoded luminance component block, an encoded chrominance component block, and a color format from the bitstream;
• decoding the encoded luminance component block to reconstruct a current block of a luminance component;
• decoding the encoded chrominance component block in the color format according to the information on the color format to reconstruct the current block of a chrominance component;
• and
• outputting a reconstructed current block including a reconstructed current block of the luminance component and a reconstructed current block of the chrominance component.