When the matrix size of a digital image decreases, the size of the pixels within the image:

When the matrix size of a digital image decreases, the size of the pixels within the image:

• A. Varies
• B. Increases
• C. Decreases
• D. Remains the Same

Answer: (B)

Pixel size grows when the sampling grid becomes coarser. When the matrix size drops, you have fewer pixels to cover the same image area, so each pixel must represent a larger portion of the image. For example, keeping the field of view the same, going from a 1000×1000 grid to 500×500 means each pixel spans about twice the width and height, so the pixel size doubles (and the area fourfold). In short, decreasing the matrix size reduces sampling density, causing the pixels to become larger.

Pixel size grows when the sampling grid becomes coarser. When the matrix size drops, you have fewer pixels to cover the same image area, so each pixel must represent a larger portion of the image. For example, keeping the field of view the same, going from a 1000×1000 grid to 500×500 means each pixel spans about twice the width and height, so the pixel size doubles (and the area fourfold). In short, decreasing the matrix size reduces sampling density, causing the pixels to become larger.