To maintain the compression options already set in the registry. (The information returned is read but not interpreted.)| Example-VB | Example-VC++ |
Returns the compression preference used by the ShowScanPreference method or the SetPageTypeCompressionOpts method.
| Ö | Imaging for Windows Professional Edition V1.0, V1.1, and V2.0 |
| Ö | Imaging for Windows 98 |
| Imaging for Windows 95 | |
| Imaging for Windows NT 4.0 |
Image Scan control
object.GetCompressionPreference(CompPreference)
CompPreferenceConstants (Integer)
| Constant | Setting | Description |
| BestDisplay | 0 (default) | Best display quality |
| GoodDisplay | 1 | Good display quality, small file size |
| SmallestFile | 2 | Smallest file size |
| CustomSettings | 3 | Custom settings |
The information returned by this method can be used as follows:
To maintain the compression options already set in the registry. (The information returned is read but not interpreted.)
To interpret compression information, and then use that information to set explicit compression options during runtime.
Predefined compression preferences are shown below.
BestDisplay
| Black and White CCITT Group 3 1D Group 3 1D Modified Huffman with reversed bit order |
| 16 Shades of Gray LZW (Professional Edition only) LZW (no compression information) |
| 256 Shades of Gray LZW (Professional Edition only) LZW (no compression information) |
| 256 Colors LZW (Professional Edition only) LZW (no compression information) |
| True Color (RGB 24 bit) Uncompressed No compression information |
| 16 Colors LZW (Professional Edition only) LZW (no compression information) |
GoodDisplay
| Black and White CCITT Group 3 1D Group 3 1D Modified Huffman with reversed bit order |
| 16 Shades of Gray LZW (Professional Edition only) LZW (no compression information) |
| 256 Shades of Gray JPEG JPEG medium resolution, medium compression |
| 256 Colors LZW (Professional Edition only) LZW (no compression information) |
| True Color (RGB 24 bit) JPEG JPEG medium resolution, medium compression |
| 16 Colors LZW (Professional Edition only) LZW (no compression information) |
SmallestFile
| Black and White CCITT Group 3 1D Group 3 1D Modified Huffman with reversed bit order |
| 16 Shades of Gray LZW (Professional Edition only) LZW (no compression information) |
| 256 Shades of Gray JPEG JPEG medium resolution, high compression |
| 256 Colors LZW (Professional Edition only) LZW (no compression information) |
| True Color (RGB 24 bit) JPEG JPEG medium resolution, high compression |
| 16 Colors LZW (Professional Edition only) LZW (no compression information) |