--blankthreshold

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--blankthreshold percentage

 

The --blankthreshold flag sets the percentage value of white pixels to dark or black pixels to determine if a page is blank.  The percentage is the percentage value to use.  The --blankthreshold flag is ignored if --noblankpages is not specified.

 

For example, if percentage is 99, this means that the page must consist of 99% "white" or blank pixels to be considered a blank page.  The lower the percentage value, the "darker" the page will be before being considered blank.

 

Example:

 

twainsave --filename test.tif --filetype tif1 --multipage --noblankpages --blankthreshold 98

 

This command acquires a multipage TIFF file that uses no compression to a TIFF file called test.tif.  If any blank pages are found, they are not saved to the TIFF file (the --noblankpages option does this).  To consider a page blank, there must be at least 98% white pixels on the page (the --blankthreshold setting).

 

Default Setting:

If --noblankpages is specified, and --blankthreshold is not specified, the threshold value is 98.