TWAIN Device

Select the desired scanner from the list of available TWAIN devices connected to your system.

• The list is populated automatically at runtime from scanner devices installed on the local machine.
• Changing this property will update the available device-specific options.
• If the device is not listed, ensure it is properly installed and recognized by Windows.

The 'Scan Area' property defines the rectangular area on each page that will be captured by the Capture Device.

• Configure this property to match the size and position of your documents within the scanner.
• Units can be specified in inches, points, millimeters, centimeters, or as a percentage of the page size (<in>, <pt>, <mm>, <cm>, <%>).
• Limiting the scan area can improve performance and reduce file size by excluding blank margins or irrelevant regions.
• The default value is typically the full page area, but can be adjusted for custom document sizes or to avoid scanning artifacts at the edges.

> This property is only visible for devices recognized as scanners.

• When enabled (true), the scanner UI is hidden and scanning proceeds without user interaction.
• When disabled (false), the native scanner UI is shown, allowing the operator to adjust settings before each scan.
• Some scanner drivers do not support hiding the interface; in such cases, this setting will be ignored.
• Use this option for unattended or automated scanning scenarios.

• When enabled, the scanner will attempt to return compressed images, reducing file size and transfer time.
• The available compression types are determined by the selected device and color format.
• Use the 'Compression Mode' property to select the desired compression algorithm.
• Not all devices or formats support compression; if unsupported, images will be returned uncompressed.

• When enabled, scanned pages are buffered in memory as they are acquired, allowing the scanner to operate at full speed.
• This is especially beneficial for high-speed, multi-page scanning workflows.
• Use in conjunction with 'Scan Ahead Maximum Images' to control memory usage.
• If disabled, each page is processed and saved before the next is scanned, which may slow down throughput.

• Set to 0 for unlimited buffering (use with caution, as this may consume significant memory for large jobs).
• Set to a positive integer to limit the number of pages held in memory at once.
• Adjust this value based on available system memory and expected batch size.

Can be one of the following values:

• Select the desired compression algorithm from the list of modes supported by the device and current color format.
• Common options include 'None', 'Jpeg', 'Group4', and 'Lzw'.
• Changing the color format in the scanner driver may affect which compression modes are available.
• If an invalid or unsupported mode is selected, scanning may fail or revert to no compression.
• Use this property in conjunction with 'Enable Compression' for optimal performance and file size.