What happens to pixel size when the matrix size increases in digital imaging?

When the matrix size increases in digital imaging, the pixel size decreases. This occurs because the image is divided into a larger number of smaller units (pixels) while keeping the overall image area constant.

To elaborate, a pixel is defined as the smallest unit of a digital image, and its size is directly influenced by the total number of pixels in the image matrix. If you have the same image area but choose to increase the number of pixels (matrix size), each individual pixel must occupy a smaller area to accommodate the greater number of total pixels. This leads to enhanced image detail and resolution, as smaller pixels can capture finer nuances in the image data. Thus, when the matrix size expands, each pixel's dimensions reduce accordingly, resulting in smaller pixels.