Question

If the file size is small or low quality, what type of lines are left horizontally on top and below the photo?

A. JPEG compression lines
B. Scanning lines
C. Noise lines
D. Watermark lines

Answer 1

Horizontal lines that appear in a compressed, low-quality photo are typically known as JPEG compression lines, which are artifacts resulting from the compression process decreasing file size at the cost of image quality.

Step-by-step explanation:

If a photo has lines left horizontally on top and below it due to a low-quality file or compression, those lines are most likely JPEG compression lines. JPEG compression is a process that reduces the file size by discarding some color information from the photo, leading to a smaller file size but also potentially lowering the quality. When an image is highly compressed, artifacts such as these horizontal lines may become visible, especially in areas where there should be subtle gradients of color or in the smooth background areas.