Illusions / Hermann grid / Make your own
Make your own Hermann grid image
Move every slider. The measured values update beside the image. Download the result as a PNG.
Measured from the image
Sliders
Things to try
- Raise the street width slowly. Note the point where the smudges stop showing up for you.
- Raise the number of squares per side. Compare the smudge at the center with one near the edge.
- Shrink the squares while the streets stay the same. Watch the ratio change in the readout.
At the default settings this image measures 384 by 384 px. The sweep on the Hermann grid page tracks White street width (px) and marks these values as weak: 34 to 40 px.
Slider ranges
| Setting | Min | Default | Max |
|---|---|---|---|
| Black square size (px) | 30 | 60 | 120 |
| White street width (px) | 6 | 14 | 40 |
| Squares per side | 3 | 5 | 9 |
Your PNG carries a small bharamind.com credit strip under the image. Entertainment only. Not a vision or health test.