LEADTOOLS TWAIN C API Introduction
The LEADTOOLS TWAIN C API provides a powerful set of functions spanning the full spectrum of digital imaging, including in-depth support for image acquisition from a wide variety of hardware devices.
Both TWAIN Specification versions (v1.9 and v2.x) are supported.
- Control any scanner, digital camera or capture card that has a TWAIN device driver. High-level acquisition support is provided for ease of use. Low-level functionality is also provided for flexibility and control in even the most demanding applications.
- TWAIN v2.x driver support: If current TWAIN driver is not v2.x or does not support a functionality listed below, then LEADTOOLS will support all of the features available in the driver that are compatible with the TWAIN v2.x specification.
- Gives applications access to the wide variety of devices which can acquire images via TWAIN from manufacturers such as Kodak, Hewlett Packard, Microtek, Logitech, Fuji, and others.
- Manage and handle multiple TWAIN sources like scanners, barcode readers, and digital cameras.
- Acquire pages from a specified source.
- Use the default user interface included with the TWAIN driver.
- Create custom user interface to the driver.
- Negotiate the TWAIN File System used for digital cameras.
- Bypass the interface entirely for completely automated tasks or batch scanning.
- Control the type of image which is acquired (black & white, b/w with halftone, grayscale, color - as supported by the device).
- Control the resolution (dpi), position, size, and orientation of the image to be acquired.
- Use the Automated Document Feeder for single- and multipage scans, including support for duplex scanning.
- Use selection dialogs to allow selection of TWAIN source, or select among multiple TWAIN sources in code.
- Use native, buffered memory, or file transfer modes when acquiring from a TWAIN device.
- Flexibly get and set all TWAIN v2.x capabilities that the device's TWAIN driver supports.
- Save the device's TWAIN capability settings to a template file.
- Save multiple source settings and load them as needed.
- Save Memory Buffered Transfer data directly to a file.
- Get the Extended Image Info that some TWAIN scanner drivers support. For example, if the scanner driver supports reading barcodes or patch codes, then that information could be retrieved via LEADTOOLS TWAIN support.
- Use compression support for buffered memory transfer mode. The scan data is compressed using JPEG, RLE, BITFIELDS, GROUP 3, GROUP 4 or PACKBITS to reduce the data transfer bottle neck.
Programming with LEADTOOLS TWAIN Functions
Summary of Supported Image File Formats
LEADTOOLS TWAIN C API changes