Diagnosing and Reporting TwainSave Problems

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In some cases, a TWAIN device either fails to acquire the image, or some other error occurs that prevents the images from being acquired.  If problems persists, the first line of defense in diagnosing the problem is to use --verbose option.

 

The --verbose option will output messages to either the screen, or if the --verboselog is specified, to a file.  These messages will denote what operation TwainSave is doing, and whether the operation was successful or unsuccessful.

 

The next, more detailed measure is to use the --diagnose and --diagnoselog options.  This will give much more low-level, detailed information as to what TwainSave and your TWAIN device is doing during the acquisition process.  The information contained in the --diagnose log may be a little overwhelming, but it contains a wealth of information that can root out problems with either the way TwainSave is operating, or how your TWAIN device is operating when asked to acquire an image or set of images.

 

 

 

Transfer Mode Issues

 

If there is a general issue retrieving pages from the TWAIN device, you can try changing the transfer mode using the --transfermode option, as changing the transfer mode to "buffered" (option 1) may clarify some issues when transferring an image with TwainSave.

 

 

 

Negative Images

 

Sometimes an image turns out as a "negative" or reverse--colored image when it is not desired.  This is sometimes the case when a buggy TWAIN driver is used when --noui is specified.  To remedy this situation, you can try the --negate option to reverse the image colors.  Please note that the issue with negative images appearing are a fault of the driver, not with TwainSave.  TwainSave is used to attempt to correct the image.

 

Also, if the image file being saved is in TIFF format, be aware that the viewer you are using to view the TIFF file may be faulty, and not the fault of the image.  There are older TIFF viewers that do not recognize reversed images (and other TIFF aspects such as multiple pages) properly.  The free IrfanView program (http://www.irfanview.com) is frequently being updated, so this program is a recommended viewer of TIFF files.

 

 

Things to do before reporting bugs to Dynarithmic Software

 

To report errors or problems with TwainSave, please open an issue at the issue page on Github