Image deskewing mode.
Values:
| IG_REC_IMG_DESKEW_AUTO | Automatic deskewing (Default). |
| IG_REC_IMG_DESKEW_NO | No deskewing applied. |
| IG_REC_IMG_DESKEW_SET | Deskew with a given angle set by the IG_REC_slope_set function. |
| IG_REC_IMG_DESKEW_3D | Automatic 3D deskewing applied. |
Remarks:
This setting determines the deskewing mode during image preprocessing.