Recognize confetti in a chart
Confetti refers to isolated stitches or tiny scattered groups of a color. It often appears when photographic noise, dithering or subtle color differences become separate floss shades. A tiny eye highlight may be intentional; a single dark cell in a flat patch of sky may be unnecessary. The location and purpose of a stitch matter more than its size alone.
Hold dimensions steady
Compare cleanup settings on the same crop, stitch width and palette limit. Otherwise, a smaller chart or fewer colors may be responsible for the change you see. Start with cleanup off, then increase it in small steps. Look at both the whole image and the grid. The generator reports region counts, but a lower number by itself does not prove that the chart is better.
Protect the focal details
Watch eyes, nostrils, whiskers, leaf tips and narrow outlines. These can be only one or two stitches wide at a small scale. Cleanup that makes a background easier may erase them. If a setting damages the subject, reduce cleanup and remove unwanted stitches selectively in the editor. A single deliberate highlight is often worth keeping even when it uses a separate color.
Reduce the cause before fixing the result
Try a tighter crop, a calmer background or a lower palette limit. Turn dithering down or off and compare the tonal result. Fewer colors can create larger stitchable areas, but they can also introduce abrupt bands in skin or skies. Avoid changing every setting at once: make one change, inspect it, and keep the better version.
Use the editor for the final pass
Inspect large flat areas for stray colors. Replace a scattered shade with a nearby existing shade when it does not carry useful detail. Keep shadows and highlights that define the form. In the illustrative grids below, the isolated red and pale stitches in a green block are removed; this is a deliberately simple example, not a benchmark of the automatic cleanup tool.
An illustrated cleanup decision
These original example grids demonstrate selective removal. On a face, the same isolated stitches might be important highlights worth keeping.