What Is a Moiré Pattern? How to Fix Moiré in Scanned Photos and Screens
imgmend Team
AI Image Tools
Moiré is a wavy interference pattern that shows up when you scan printed photos or photograph a screen. Here is what causes it and how to reduce it — free, online.
What Is a Moiré Pattern?
A moiré pattern is a wavy, rainbow-like interference pattern that appears when two fine repeating grids overlap slightly out of alignment. It's different from ordinary image noise or grain — noise is random, but moiré is a structured, wavy distortion caused by two regular patterns clashing: the halftone dots of a printed photo and the pixel grid of your scanner or camera sensor, for example.
You've probably seen moiré without knowing its name: the shimmering rainbow bands on a striped shirt on TV, the wavy lines on a photographed computer monitor, or the odd ripple effect across a scanned magazine page.
Where Moiré Shows Up Most Often
- Scanning printed photos or magazines — the scanner's sensor grid interferes with the halftone dot pattern used in offset printing
- Photographing a screen or monitor — your camera's sensor grid interferes with the screen's pixel grid
- Fine repeating fabric patterns — herringbone, houndstooth, and tight stripes are classic moiré triggers
- Photographing window screens, mesh, or perforated metal — any fine regular grid can produce it
Moiré vs. Grain vs. JPEG Artifacts — What's the Difference?
These three are easy to confuse but need different fixes:
| Problem | Looks Like | Cause |
|---|---|---|
| Moiré | Wavy, colored ripple or rainbow bands in a regular pattern | Two fine grids overlapping (print dots vs. sensor, screen vs. sensor) |
| Grain / noise | Random speckled texture, no repeating shape | High ISO, low light, small sensor |
| JPEG artifacts | Blocky 8×8 squares, ringing near edges | Lossy compression |
If your issue looks grainy rather than wavy, see our guide on how to fix grainy photos instead — the fix is different.
How to Fix Moiré in a Scanned or Photographed Image
Upload the affected photo to imgmend.com — the AI denoising model can meaningfully reduce mild-to-moderate moiré by reconstructing pixel data around the interference pattern. It works best on subtler moiré (light rippling in fabric or screen photos); it's honest to say that severe moiré with strong color banding is difficult for any single-pass AI tool to fully remove, moiré-specific software (like dedicated demoiréing filters in professional RAW processors) will do better on extreme cases.
- Go to imgmend.com — no account needed
- Upload your photo (JPG, PNG, or WEBP, up to 10MB)
- Let the AI process it — 10 to 30 seconds
- Compare before/after with the slider and download
How to Prevent Moiré When Scanning or Photographing
- Rotate the source slightly — scanning or photographing at a small angle (5–10°) instead of perfectly aligned often breaks the grid interference
- Change the scan resolution — moiré is resolution-dependent; try scanning at a different DPI (e.g., 600 instead of 300) and downsize afterward
- Move slightly further from screens — increasing camera-to-screen distance changes the relative grid size and can eliminate the effect
- Use a polarizing filter — helpful when photographing glossy printed material or screens
Frequently Asked Questions
What causes a moiré pattern in photos?
Moiré happens when two fine, regular patterns overlap slightly out of alignment — most commonly a scanner or camera sensor's pixel grid interfering with a printed halftone dot pattern, a screen's pixel grid, or a fine repeating fabric weave.
Can Photoshop remove moiré patterns?
Yes — Photoshop has a dedicated "Reduce Noise" filter with moiré-specific settings, plus a Gaussian Blur trick some editors use on the offending channel. For a free, no-install option, imgmend's AI denoiser handles mild-to-moderate moiré directly in the browser.
Does imgmend completely remove moiré?
For subtle to moderate moiré (light rippling from screens or fine fabric), results are typically strong. For severe moiré with heavy color banding — often from scanning glossy magazine prints — expect meaningful reduction rather than complete removal in a single pass.
Is moiré the same as image noise or grain?
No. Grain is random speckling from high ISO or low light. Moiré is a structured, wavy interference pattern from two overlapping grids. They look different and can require different fixes, though AI denoising models can help with both.
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