File:EB1911 Vision - Effect of Irradiation.jpg
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EB1911_Vision_-_Effect_of_Irradiation.jpg (588 × 331 pixels, file size: 47 KB, MIME type: image/jpeg)
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Summary
| Description |
English: If we look at the figure, the white square in the black field appears to be larger than the black square in the white field, although both are of precisely the same size. This is due to irradiation. The borders of clear surfaces advance in the visual field and encroach on obscure surfaces. Probably, even with the most exact accommodation, diffusion images form round the image of a white surface on a black ground, forming a kind of penumbra, thus causing it to appear larger than it really is. |
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| Date | published 1911 | |||
| Source | “Vision,” Encyclopædia Britannica (11th ed.), v. 28, 1911, p. 137, fig. 16. | |||
| Author | Unknown artist | |||
| Permission (Reusing this file) |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:52, 5 September 2021 | | 588 × 331 (47 KB) | Bob Burkhardt | {{Information |description = {{en|1=If we look at the figure, the white square in the black field appears to be larger than the black square in the white field, although both are of precisely the same size. This is due to ''irradiation''. The borders of clear surfaces advance in the visual field and encroach on obscure surfaces. Probably, even with the most exact accommodation, diffusion images form round the image of a white surface on a black ground, forming a kind of penumbra, thus causing... |
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