4-7Chapter 4 Other Functions■ Selectable BackgroundYou can specify whether the background behind thescanned image is black or white.The background is changed by rotating the platen rollers toexpose either the black or white part of the rollers,according to the selection specified in the ISIS/TWAINdriver.IMPORTANTImage processing performance depends on the selectedbackground (black or white). (See “Background Color” onp. 8-18.)■ Folio ScanUse Folio Scan to scan very large documents (up to 22" ×34"/A1 size) by folding each document sheet and scanningthe front and back. The resulting images are thenrecombined to reconstruct an image of the entire page.IMPORTANT• Folio scanning requires that you feed each page manually(The Bypass Mode key is lit).• Fold each page with a sharp, straight crease. Otherwise, thepaper may jam or the image may be misaligned.• Seam artifacts may appear in the reconstructed imagebecause of the crease line or differences in the loadingposition of each side.• The scan image of the front side becomes the left half of thereconstructed image.• The maximum document size for Folio Scan is 22" × 34"/A1.• 22" × 34"/A1 document pages should be folded lengthwiseand scanned with the following settings:Scanner: Long Document Mode [ON1]Page Size: Auto-Detection• Some scanning mode and resolution settings may produceincomplete page images. In this case, try decreasing theresolution or, if scanning in color mode, switch to black andwhite.Platen Rollers (Black/WhiteBackground Rollers)WhiteBrushBlackReconstructed ImageBypassMode KeyFront(whenfolded)Back(whenfolded)
