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5.4.3 Align

The align function reads weave maps from two different paintings, both at the same resolution and using the same color scheme, and allows moving the images around in order to look for good thread count matches. For example, suppose that the agreement between the thread counts of Woman Writing a Letter, with her Maid (L31) and Woman with a Lute (L14) suggest the possibility of a weave match. Figure 5.15 shows the align program immediately after choosing these two files. As it reads a pair of images, align calculates and displays a common set of colors. Looking at the color bar in Figure 5.15, the blue tinge of the horizontal thread map of A Lady Writing a Letter with her Maid (L31) is centered somewhere near 11 threads/cm, while red coloring of the horizontal thread map of Woman with a Lute (L14) shows it is nearer 20 threads/cm. No match is possible!

However, selecting the vertical weave map of A Lady Writing a Letter with her Maid (L31), by changing the selector from H to V, presents the more promising situation shown in Figure 5.16. Clearly, the two images have features of the same general magnitude. After rotating Woman with a Lute (L14) by 270 degrees, it is possible to slide the images around (using the mouse) to achieve a convincing match, as shown in Figure 5.17.

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Figure 5.15: Opening the align function and selecting Woman Writing a Letter, with her Maid (L31) and Woman with a Lute (L14) does not appear promising at first.

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Figure 5.16: Choosing to display the vertical weave map of
Woman Writing a Letter, with her Maid (L31) simultaneously with the horizontal map of Woman with a Lute (L14) realigns the display, and features in the two images become comparable.

Fig5-17.jpg
Figure 5.17: After suitable choices are made (in this case, rotating the Woman with a Lute (L14) canvas by 270 degrees), the two weave maps can be repositioned using the mouse to provide a more convincing match.


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