| Value | Symbolic Constant | Description | ||
| 0 | NO_ERROR | No error | ||
| -1 | BAD_RANGE | Range error* | ||
| -2 | NO_DIG | Digitizer board not detected | ||
| -3 | BAD_DSK | Disk full, file not written | ||
| -4 | BAD_OPN | Filename not found | ||
| -5 | BAD_FAC | Variable out of range | ||
| -6 | BAD_TIFF | Unreadable TIFF format | ||
| -8 | BAD_BPS | TIFF bits per sample not supported | ||
| -9 | BAD_CMP | Unreadable compression scheme | ||
| -10 | BAD_CRT | Cannot create file | ||
| -11 | BAD_FTPE | Unknown file format | ||
| -12 | BAD_DIB | Image is compressed DIB | ||
| -14 | BAD_MEM | Insufficient memory for function | ||
| -16 | BAD_PCX | Unreadable PCX format | ||
| -17 | BAD_GIF | Unreadable GIF format | ||
| -18 | PRT_ERR | Print error | ||
| -19 | SCAN_ERR | Scanner error | ||
| -25 | BAD_TGA | Unreadable TGA format | ||
| -26 | BAD_BPP | Bits per pixel not supported | ||
| -27 | BAD_BMP | Unreadable BMP format | ||
| -33 | NO_DEV_DATA | No data from device | ||
| -34 | TIMEOUT | Function timed out | ||
| -40 | BAD_LOCK | Could not lock memory (invalid handle or memory discarded) | ||
| -41 | PRT_BUSY | Print function already executing | ||
| -42 | BAD_IBUF | Invalid image buffer address | ||
| -43 | BAD_JPG | Unreadable JPEG format | ||
| -44 | TOO_CPLX | Image is too complex for operation | ||
| -45 | SCAN_UNLOAD | Paper could not be unloaded | ||
| -46 | SCAN_LIDUP | ADF lid was opened | ||
| -47 | SCAN_NOPAPER | ADF bin is empty | ||
| -48 | SCAN_NOADF | ADF is not connected | ||
| -49 | SCAN_NOTREADY | ADF is connected but not ready | ||
| -50 | NOT_AVAIL | Function not available due to missing module | ||
| -51 | TIFF_NOPAGE | Page not found | ||
| -52 | BAD_PTR | Pointer does not point to readable or writable memory | ||
| -53 | LZW_DISABLED | LZW compression/decompression not enabled | ||
| -54 | TWAIN_NOWND | Could not create TWAIN parent window | ||
| -55 | TWAIN_NODSM | Could not open TWAIN Source Manager | ||
| -56 | TWAIN_NODS | Could not open TWAIN Data Source | ||
| -57 | TWAIN_ERR | TWAIN image acquisition error | ||
| -58 | TWAIN_NOMATCH | None of the elements in two lists were equal | ||
| -59 | TWAIN_BAD_DATATYPE | Data type mismatch | ||
| -60 | TWAIN_SCAN_CANCEL | User canceled scan | ||
| -61 | TWAIN_BUSY | TWAIN function is busy | ||
| -62 | BAD_DATA | File contains invalid data | ||
| -63 | BAD_PNG | Unreadable PNG format | ||
| -64 | BAD_PNG_CMP | PNG compressor error | ||
| -65 | NO_ACK | No ACK from device | ||
| -66 | TWAIN_NO_PAPER | TWAIN ADF is empty | ||
| -67 | TWAIN_STOP_SCAN | Stop scanning images | ||
| -68 | BAD_HANDLE | Handle not valid | ||
| -69 | TIFF_MOTYPE | TIFF file is in Motorola byte order | ||
| -70 | BAD_TN_SIZE | Thumbnail size out of range | ||
| -71 | GIF_NOFRAME | GIF frame not found | ||
| -72 | BAD_DIGI_MEM | Insufficient digitizer memory for selected mode | ||
| -73 | BAD_DIM | Image format does not support width or length > 65535 |
*BAD_RANGE indicates that one of the following conditions exists: