The contrast of a photograph is measured by (A) Pixels (B) Aspect ratio (C) Focal point (D) f-stop Correct Ans: (A) Explanation: Photographers measure the contrast of a photograph using pixels, which represent the smallest units of an image. Pixels form the foundation of digital photography, enabling professionals to evaluate differences in brightness between the darkest and lightest areas. This evaluation allows them to ensure sharpness, clarity, and overall visual quality. When professionals examine contrast, they focus on the tonal range and its distribution within the image. A higher pixel count enhances contrast measurement, offering more details and a wider range of tones. Consequently, this creates a vivid and dynamic photograph. Other elements, such as aspect ratio, focal points, and f-stops, serve different purposes in photography. For example, the aspect ratio determines the shape and framing of an image, while focal points guide the viewer's attention to specific areas. Similarly, f-stops control the aperture size, regulating light exposure and depth of field. However, none of these directly measure contrast like pixels do. In summary, pixels remain the most accurate way to assess contrast in photographs. Their ability to highlight tonal differences allows photographers to achieve balance and enhance visual appeal. Understanding the role of pixels ensures better control over the final outcome of any photograph.