When users notice horizontal streaks in their scans, they often suspect a problem with the device itself. However, this phenomenon is often related to several factors: 1. Scratches on the glass plate: A core component of a scanner is the transparent glass plate, which holds the document or photo to be scanned. If the glass surface is scratched or worn, these scratches will be detected during the scan, resulting in noticeable horizontal streaks. 2. Uneven lighting: Some low-end scanners may have uneven light distribution, resulting in brighter areas in some areas and darker areas in others, creating a visual "striated" effect.
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