WATCH THE STROKE-WIDTH TEST

Coloring Page Maker: One Stroke, Two Outlines

Three original inputs and nine actual traces show paired edges rather than preserved stroke fills.

Read the measurements and limitations · Download MP4

Transcript

Why can one thick line become two outlines in a coloring page maker? This tool traces changes at the edges of a dark stroke. Both sides can become separate contours. If your source is already clean black and white line art, compare it with the converted version before tracing it again.

We made three original six hundred by four hundred pixel inputs. Each contains the same horizontal black line on white. Only the stroke width changes: one, three, or nine pixels. We ran the current unchanged site function with Clean Outline, Detailed and Simplified: nine outputs.

At the center column, the one pixel input produced dark rows one hundred ninety nine and two hundred one. The three pixel input produced rows one hundred ninety eight and two hundred two. The nine pixel input produced two thicker groups: rows one hundred ninety five and six, then two hundred four and five. All three presets matched in this test.

These are edge locations, not a quality score or proof about every photo. Changing the preset did not remove the paired contours here. Keep the original, inspect the same crop at full size, and compare the downloadable fixtures. Use a ready made worksheet directly when it already has the coloring spaces you want.