# ee.Image.signum

Computes the signum function (sign) of the input; 0 if the input is 0, 1 if the input is greater than 0, -1 if the input is less than 0.

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| Usage | Returns |
|---|---|
| `Image.signum()` | Image |

| Argument | Type | Details |
|---|---|---|
| this: `value` | Image | The image to which the operation is applied. |