Increasing the matrix size primarily affects which aspect of an image?

Increasing the matrix size primarily affects pixel size because a larger matrix consists of more pixels representing the image. When the matrix size is expanded, it divides the same image area into more pixels, making each pixel smaller. This results in a higher spatial resolution for the image, allowing for more detail to be represented because smaller pixels can capture finer features.

While the image size may also be associated with a larger matrix size in terms of file size or the total number of pixels, it is the reduction in pixel size that directly results from dividing the space into a greater number of smaller pixels within the matrix. Color depth refers to the number of bits used to represent the color of each pixel and is not directly impacted by changes in matrix size. Similarly, the compression ratio pertains to how much the image data can be compressed and does not inherently change with matrix size adjustments.