| Value | Description |
|---|---|
| Twain_AutoDiscard_Disable (-2) | All images will be delivered to the application even if they are blank |
| Twain_AutoDiscard_DiscardBlank (-1) | The scanner will decide if an image is blank or not and discard as appropriate |
| >=0 | The scanner will use the value as the byte size cut-off point to identify which images to discard. If the image size is less than or equal to this value, then it will be discarded. If the image size is greater than this value, then it will be transferred to the application |