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5.6 Image
This menus groups operations which apply only to images.
- Duplicate
- This makes a copy of an image.
- Crop
- This crops out the centre 50% of an image. If you open a viewer on
the image you cropped, you'll see a region you can drag to set
the crop area. You can also type numbers into the boxes.
- Insert
- This takes two images and pastes the second into the centre of the
first. The two images have to match in number of bands.
If you open an image viewer on the first image, you'll see an area
which you can drag around to set the exact insert point.
- Join=>Left_right, Join=>Top_bottom
- Use to join two images together side-by-side. Open up the joined row
to change the way the join is made.
- Join=>Array
- Use to join a rectangular array (a list of lists) of images together.
Use Edit=>Group to group all the image rows together, then
select all the rows and group again to make the whole array. Click on
Join=>Array to join the array into a single large image. Open
the row to adjust the spacing.
- Rubber=>Find
- Use this to automatically calculate a geometric transform which will
warp one image to match another. Select a reference image, select a
sample image, and click Rubber=>Find. Open up the row to
adjust the transformation search parameters. One band, 8 bit images
only. The images must be exactly the same size.
- Rubber=>Apply, Rubber=>Scale
- Use this to apply the transform calculated by Rubber=>Find to
another image. Select the transform row, select the image to be
transformed and click Rubber=>Apply. Any image type.
Transforms are not
scale-invarient: use Rubber=>Scale if you want to use a
transform calculated on an image of one size on an image of another
size.
- Adjust_scale_offset, Adjust_gamma
- Use to change the tone curve of an image.
- Edit_header
- This lets you change the various `informational' fields in the VIPS
image header, such as origin, type and resolution.
- Match
- Use this to match any two images of different sizes.
two images to be matched, click Match=>, and drag
the points to mark common features. The second image is rotated and
scaled to match the first.
- Overlay
- Use this to make a colour overlay of two monochrome images
of different sizes. Select the two images to be used, click
Overlay=>, drag the points to mark common
features.
- Browse_multiband
- Use to browse through the bands of a many-band image.
Next: 5.7 Math
Up: 5. Image processing menus
Previous: 5.5 Histogram
  Contents
John Cupitt
2003-07-21