What aspect does chrominance subsampling retain for each pixel during compression?

The concept of chrominance subsampling focuses on the way color information is processed and stored during compression. When chrominance subsampling is employed, the method emphasizes retaining the color accuracy of a video signal while reducing the bandwidth required for color data.

In this process, color information (chrominance) is sampled at a lower resolution compared to the brightness information (luminance). This takes advantage of the human eye's greater sensitivity to brightness changes compared to color differences, allowing for the reduction of data without significantly impacting perceived image quality. As a result, while the overall color information is retained, it is represented in a manner that minimizes data usage.

The other aspects listed, such as brightness information, detailed motion vectors, and original pixel resolution, are not the primary focus of chrominance subsampling. Brightness information remains prominent and retains its original resolution. Detailed motion vectors are related to video compression techniques that focus on motion estimation but are not specific to chrominance subsampling. The original pixel resolution is not preserved in chrominance subsampling, as that is part of the compression technique that aims to reduce the overall data size.