Sketchy Portrait
Converts an image into pen-plotter strokes using the Blackstripes sketchy algorithm — iteratively finding and drawing the darkest line in the image.
Source Image
🖼️
Upload or Drop Image
PNG or JPG — drag & drop supported
Algorithm
Grayscale Mode
Luminance (0.299R+0.587G+0.114B)
R channel (match C original)
Contrast Expansion
0%
Pushes darks darker & brights brighter (S-curve)
Max Processing Resolution (px)
800
Max Segment Length (px)
20
Nib Size / Kernel (px)
1
Max Segments (safety limit)
20000
Target Coverage (%)
100%
Stop condition — >100% overdraws for denser results
Output & Pen
Output Size (mm)
420
Stroke Width (mm)
0.2
Line Color
#000000
Actions
Optimize SVG for plotter
Show original image behind SVG
Export SVG
Generate
Stop
0%
Segments:
0
Brightness match:
—
Output:
420 × 420 mm
Image:
none
Output (plotter-ready)
Upload an image, then click Generate