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5.8.2 Mosaic
The items in this menu are discussed in appalling detail in
Chapter 3.
- One Point
- Join two images left-right or top-bottom with a simple
translation. Mark a point on each image to be joined (open image
view window, Ctrl-left-click, drag to position), then click on the
mosaic button. The
operation performs elaborate tie-point adjustment, so your selection
of a common feature does not have to be exact.
The Manual versions do not perform automatic tie-point correction
and are useful when joing very difficult images.
- Two Point
- Do a join, but allow the right-hand (or bottom) image to rotate and
scale if it will improve the match. You need to pick two points on
each image.
- Balance
- Break a mosaic apart, examine average pixel value in the overlap
regions, adjust brightness to match, and reassemble. This only works
for images which have been produced just by mosaic joins! If you've
done anything else to the image since loading it, the balance will
fail with a mysterious message.
- Manual Balance
- Adjust the brightness in a set of masked areas to match. Useful for
removing shadows.
- Rebuild
- Use this to mosaic up one set of files based on joins you made
in another. Breaks a mosaic part to component files, performs a
string substitution on the file names, and reassembles.
- Clone Area
- Select over- or under-exposed pixels in one image and replace them
with the corresponding pixels from another image. Useful for removing
lead numbers used to identify X-ray plates.
The function
operates on two 8-bit mono images. Move and resize the region
on the first image to define the area around the white number.
Move the region on the second to overlapping area. A section of the
area on the second image is cloned and blended into the first image.
The amount of the defined area to be cloned in defined by a slider
within the output image.
Next: 5.8.3 Picture Frame
Up: 5.8 Tasks
Previous: 5.8.1 Capture
Contents
John Cupitt
2004-12-20