写真からきれいなアイロンビーズ図案を作るコツ

Whether a photo becomes a good bead pattern is decided before you press convert. Most muddy results are not an algorithm problem: they come from three things being set wrong — grid size, color count and background.

1. Choose the grid first, not the colors

Grid size decides how much detail can survive. Rough guidance: a face portrait needs at least 48 × 48, a full-body shot 64 × 64 or more, a landscape at least 96 beads wide. Conversely, a 32 × 32 full-body shot always fails — not because the algorithm is weak, but because there is not enough information.

2. Keep the palette between 12 and 24

At 5 mm, the eye cannot separate two neighbouring similar shades. Rather than keeping 60 colors that average into grey, cut to 12 to 24 so every block of color actually reads. If detail disappears after cutting colors, the grid was too small — go back and add beads, not colors.

3. Clean the background first

• A flat background (white wall, plain cloth) is ideal — remove it in one click.
• Busy backgrounds (street, bookshelf) should be cropped away or the subject cut out first.
• Semi-transparent edges — hair, fur — leave a ring of stray color. Erasing it by hand afterwards is fastest.

4. Always retouch after converting

Automatic conversion always leaves noise: one isolated dark bead on a cheek, a ring of halftone at the edge. The fix is simple — zoom in, paint isolated beads to the surrounding dominant color, and redraw the eyes, mouth line and outline by hand. Five minutes of retouching roughly doubles the final quality.

5. Settings worth reusing

• Portrait: 48 × 48, 16 colors, background removal on, merge-similar at a medium value.
• Pets: 56 × 56, 20 colors, background removal usually needs manual patching; fur muddies easily.
• Landscape or object: 96 × 96 or larger, 24 colors, merging off — merging flattens the depth.