Custom dither pattern data. 0x0549 ∙ 1353
For scanners that support two downloadable dithering patterns, IG_ISIS_TAG_DITHER_PATTERN2 specifies the data for each element of the second downloadable dithering pattern.
IG_ISIS_TAG_TYPE_LONG
Drivers for scanners that support at least two downloadable dither patterns.
An array of values, each with valid choices in the range of 0 - 255, that specify the data for a rectangular custom dither pattern. This tag has a number of elements equal to the product of IG_ISIS_TAG_DITHER_LENGTH2 and IG_ISIS_TAG_DITHER_WIDTH2.
To create a downloadable dithering pattern, establish a width and length of the pattern, then fill in the values for each element of the pattern by calling IG_ISIS_tag_set_long. You can also let the user select an existing dither file by calling IG_ISIS_drv_read_dither_file. For more information on downloadable dither patterns, consult the documentation supplied with scanners that support downloadable dither patterns.