The cropping rectangle must be unambiguously specified by using any two of -top, -bottom, and -height, plus any two of -left, -right, and -width.
The cropping rectangle may fall partially or completely outside an image it is crop ping; in that case, the area outside is filled with zeros.
vcrop| -in | input image |
| -out | output image |
| -top | Specifies the first (top) row of the cropping rectangle. |
| -bottom | Specifies the last (bottom) row of the cropping rectangle. |
| -left | Specifies the first (leftmost) column of the cropping rectangle. |
| -right | Specifies the last (rightmost) column of the cropping rectangle. |
| -height | Specifies the height of the cropping rectangle. |
| -width | Specifies the width of the cropping rectangle. |
1.2.15