Video processing method and apparatus for using palette mode

A non-transitory computer readable medium storing a bitstream, wherein the bitstream comprises:

• a first palette entry for palette coding a target coding unit (CU);
• a default palette entry for palette coding the target CU;
• an indicator, indicating whether the target CU is part of a single-tree slice and whether the target CU is coded with separate luma and chroma trees;
• wherein in response to the indicator indicating that the target CU is part of a single-tree slice and is coded with separate luma and chroma trees,
• a first component of the target CU is encoded based on the first palette entry;
• and
• a second component of the target CU is encoded based on the default palette entry.

A video decoder capable of being enabled to implement a palette mode for a non 4:4:4 color format, the non 4:4:4 color format including at least one of a 4:2:0 color format, a 4:2:2 color format, or a monochrome color format, the video decoder comprising:

• means for receiving a first palette entry for palette coding a target coding unit (CU);
• means for determining whether the target CU is part of a single-tree slice;
• means for determining whether the target CU is coded with separate luma and chroma trees;
• and
• means for, in response to the target CU being determined to be part of a single-tree slice and to be coded with separate luma and chroma trees,
• decoding a first component of the target CU based on the first palette entry, and
• decoding a second component of the target CU based on a default palette entry.