Method and apparatus for video coding

A method of video decoding for a decoder, the method comprising:

• receiving first signaling information and second signaling information from a coded video bitstream of a coded region, the first signaling information indicating a dual tree maximum transform size of the coded region based on a dual tree partition mode, and the second signaling information indicating a single tree maximum transform size of the coded region based on a single tree partition mode;
• determining whether an adaptive color transform (ACT) is applied on the coded region based on the dual tree maximum transform size indicated by the received first signaling information and the single tree maximum transform size indicated by the received second signaling information;
• and
• decoding the coded region based on whether the ACT is determined to be applied.

An apparatus for video decoding, comprising:

• processing circuitry configured to:
• receive first signaling information and second signaling information from a coded video bitstream of a coded region, the first signaling information being indicative of an intra maximum transform size of the coded region based on an intra prediction mode, and the second signaling information being indicative of an inter maximum transform size of the coded region based on an inter prediction mode;
• determine whether an adaptive color transform (ACT) is applied on the coded region based on the intra maximum transform size indicated by the received first signaling information and the inter maximum transform size indicated by the received second signaling information;
• and
• decode the coded region based on whether the ACT is determined to be applied.