Image encoding/decoding method, method of transmitting bitstream, and recording medium in which bitstream is stored

An image encoding method performed by an image encoding apparatus, the image encoding method comprising:

• deriving a plurality of direct mode (DM) candidates for a chroma block;
• determining any one mode of default modes and the plurality of DM candidates for the chroma block;
• and
• intra-predicting the chroma block based on the determined mode,
• wherein the default modes are modified based on whether the default modes are the same as the plurality of DM candidates, and
• wherein first information indicating the determined mode is encoded in a bitstream.

A method of transmitting a bitstream generated by an image encoding method, the image encoding method comprising:

• deriving a plurality of direct mode (DM) candidates for a chroma block;
• determining any one mode of default modes and the plurality of DM candidates for the chroma block;
• and
• intra-predicting the chroma block based on the determined mode,
• wherein the default modes are modified based on whether the default modes are the same as the plurality of DM candidates, and
• wherein first information indicating the determined mode is encoded in a bitstream.