TWAIN is an interface used to import from imaging devices, such as scanners. For more information, see the TWAIN Working Group's website at www.twain.org. The Photoshop TWAIN plug-in connects with compatible devices that are installed on your computer.
The TWAIN Plug-in is not supported in currently supported versions of Photoshop.
Due to limitations with TWAIN in Photoshop, we strongly suggest the following alternatives for scanning your images:
Most scanners provide a stand-alone scanning application that can be used to scan and save images. Using the stand-alone scanner software avoids issues associated with TWAIN. Using a dedicated application to scan allows you to retouch and edit images in Photoshop while you scan in the background – which can be more efficient.
If you use a stand-alone scanning application, save your scanned images as TIFF files, then open them into Photoshop.
Some scanner software lets you designate Photoshop as the external editor for an image after a scanning is completed. Consult the documentation that came with your scanner or contact your scanner manufacturer for more details.
Use Apple’s ImageKit technology instead of TWAIN to scan directly into Photoshop. Support for ImageKit is built in to Photoshop without requiring a plug-in, and provides access to many scanners.
Use the WIA (Windows Image Acquisition) interface for your device, if it’s available, to scan directly into Photoshop.
Contact your scanner manufacturer for more information on scanning using ImageKit or WIA.