High ISO generally improves performance in low-light conditions but increases what?

High ISO generally improves performance in low-light conditions but increases what?

• A. Noise
• B. Color Accuracy
• C. Dynamic Range
• D. Exposure Time

Answer: (A)

Raising ISO makes the camera sensor more sensitive to light, which helps you capture brighter images in dim conditions without needing longer shutter speeds or wider apertures. The trade-off is that the signal is amplified along with the sensor’s random electronic variations, so you get more visible noise—grain or speckles—in the image as ISO goes up. That’s why the best choice is the option describing noise. Color accuracy isn’t improved by higher ISO; higher sensitivity can introduce color noise and tonal shifts that degrade fidelity. Dynamic range typically shrinks as ISO increases, because amplifying the signal reduces the range between the darkest and brightest details you can record. Exposure time, on the other hand, is something you control separately; higher ISO often allows you to use a shorter exposure, not a longer one.

Raising ISO makes the camera sensor more sensitive to light, which helps you capture brighter images in dim conditions without needing longer shutter speeds or wider apertures. The trade-off is that the signal is amplified along with the sensor’s random electronic variations, so you get more visible noise—grain or speckles—in the image as ISO goes up. That’s why the best choice is the option describing noise.

Color accuracy isn’t improved by higher ISO; higher sensitivity can introduce color noise and tonal shifts that degrade fidelity. Dynamic range typically shrinks as ISO increases, because amplifying the signal reduces the range between the darkest and brightest details you can record. Exposure time, on the other hand, is something you control separately; higher ISO often allows you to use a shorter exposure, not a longer one.