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Image / Local tool
Scanline Effect Maker
Apply periodic horizontal darkening with configurable spacing and strength for a display-line effect. Processing stays in this browser, the original file is never uploaded, and exported pixels contain no source metadata.
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Analysis report
◎ Images are never uploaded; Canvas re-encodes exports without original metadata.
Result
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Method, example & boundaries
Scanline Effect Maker: from input to a reviewable result
Apply periodic horizontal darkening to a local image with explicit spacing and strength controls. The deterministic Canvas effect is useful for a display-line treatment because the page exposes the actual interval instead of hiding it behind a style preset.
Worked example: 1080 px image at 4 px spacing
- Example input
- 1920×1080 source; line spacing 4 px; darkness 35%.
- Example output
A 1920×1080 rendered image with approximately 270 affected horizontal rows.
How to interpret it
Every fourth row is darkened, so 1080 ÷ 4 gives 270 periodic lines while the other rows retain their original values.
Periodic pixel darkening
The renderer walks output rows at the selected spacing and scales affected RGB values by the chosen darkness amount while retaining canvas dimensions and alpha. The processed pixels are then exported locally.
Display-effect boundaries
- Resizing the result later can blur lines or create moiré patterns.
- The effect darkens rows; it does not simulate phosphor masks, bloom, curvature, or animation.
- Strong settings can reduce readability and should be reviewed at final display size.
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