Cross Stitch Pattern Test

v23: diagnostics export now includes the true colour grid and background mask (background detection still being tuned)

Upload an already illustrated image Stitch width

Original

Original upload

Downsampled preview

Max thread colours

Limits the pattern to this many DMC threads. Pixels are snapped to the nearest of these once the limit is applied.

Colour assignment method

Direct match snaps each region to one flat colour. Atkinson spreads a small part of each colour choice's error to neighbouring stitches, the way traditional image dithering works.

Colour distance formula

Euclidean treats red, green and blue as equally important. Redmean weights them the way human eyes actually perceive colour differences, similar to what pixel-stitch.net uses.

Pattern preview

Filter confetti (merge isolated stitches) Max group size to merge Min surrounding uniformity %

Only merges a stitch if this much of the area around it already shares one colour, so real detail (like facial features) is left alone.

True colour (before DMC snap)

DMC matched

Cluster diagnostics

Real numbers from this specific image, at each pipeline stage. Use this to see exactly which clusters merged and how far apart they were, instead of guessing.