What elements make up a digital image?

• A. Picture elements (pixels) and shades of gray
• B. Voxels and color spaces
• C. Light photons and color channels
• D. Grains and halftone dots

Answer: (A)

Digital images are built from picture elements, called pixels, arranged in a 2D grid. Each pixel holds a brightness value that represents how light or dark that spot should appear. When you have grayscale, that single value per pixel determines the shade from black to white, and the entire grid of these shades forms the image. In color images, each pixel stores multiple color values (like red, green, and blue), but the basic building block remains the pixel grid. The other concepts—voxels for 3D data, color spaces as models for color, light photons as physical particles, or halftone dots and grains from printing—don’t describe the actual digital image data structure itself.