| Constant name | Constant | Description |
| GRADIENT_FILLSTART | 1 | If this flag is specified, the area before the gradient will be colored with Color1. |
| GRADIENT_FILLEND | 2 | If this flag is specified, the area behind the gradient will be colored with Color2. |
| Image Number | Integer | The ID of the image. |
| X1 | Integer | The X coordinate of the starting point of the gradient. |
| Y1 | Integer | The Y coordinate of the starting point of the gradient. |
| X2 | Integer | The X coordinate of the end point of the gradient. |
| Y2 | Integer | The Y coordinate of the end point of the gradient. |
| Color1 | DWORD | The Color of the starting point of the gradient. |
| Color2 | DWORD | The color of the end point of the gradient. |
| Channel | DWORD | The channel(s) used for the gradient. |
| Mode | Integer | The draw mode of the gradient. |