Illusions / Simultaneous contrast / Make your own
Make your own Simultaneous contrast 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
- Set both surround levels to the same value. Watch the patches match.
- Move the light surround down in steps. Note where the two patches start to look alike.
- Change the patch gray level and repeat. Compare dark patches with light ones.
At the default settings this image measures 440 by 220 px. The sweep on the Simultaneous contrast page tracks Right surround grey level and marks these values as weak: 40 to 160 grey level.
Slider ranges
| Setting | Min | Default | Max |
|---|---|---|---|
| Grey level of both patches | 0 | 128 | 255 |
| Left surround grey level | 0 | 40 | 255 |
| Right surround grey level | 0 | 215 | 255 |
| Patch size (px) | 30 | 100 | 200 |
| Surround square size (px) | 120 | 220 | 400 |
Your PNG carries a small bharamind.com credit strip under the image. Entertainment only. Not a vision or health test.