Reference tiles are four printed 8 x 8 cm squares laid around the pattern piece when you photograph it. They give the image a known scale and a known orientation.
A single square would fix the scale at one spot only, and everything further away would be extrapolated from it. Four tiles placed around the piece span the whole area the piece occupies, so the correction is distributed across it instead of being projected outward from a corner. That is also why they belong around the piece and not next to it.
Leave roughly a centimetre between tile and pattern piece. With no gap at all the two cannot be told apart; with too much gap accuracy suffers. The tiles follow the contour of the piece along its edges and do not have to form a rectangle, so they may sit along a curve. Nothing of the piece may stick out past them, a trouser leg reaching beyond the tiles included.
Tile A carries arrows and marks which way is up. It tells PatternScan Pro the orientation of the shot, so the piece arrives the right way round instead of rotated or mirrored.
PatternScan Pro derives scale and perspective correction from their known edge lengths. That is why they sit about a centimetre from the piece, follow its contour, and must not be covered. Lead tile A points upwards. Printing and placing the tiles is covered in its own guide.
Digitize sewing patterns without tracing.
Test PatternScan Pro free for 14 days with the full feature set. You need your smartphone, a printer and one pattern you always wanted digital.
Photograph your paper pattern and get an automatically scaled digital version with PatternScan Pro.
Usage
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