To save one of these images (in the full size indicated in the caption),
right-click the desired image, and in the drop-down menu select "Save
image as..." or "Save picture as...".
Normalized - the image has been
cropped to include only the patch; it has been resized to a standard
size (smallest axis 500 pixels); and the white and black points have
been adjusted to white and black (roughly speaking, the "contrast"
has been adjusted so that what should be white is white,
and what should be black is black).
Retouched - starting from the normalized
image, variations in lighting have been removed, color balance has been
adjusted where needed, and slight imperfections in the artwork have
been removed.
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