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<h3 class="sectionHead"><span class="titlemark">5.4 </span> <a
id="x26-480005.4"></a>Image</h3>
<!--l. 321--><p class="noindent" ><a name="nip_label_sec:menu-image"></a>
<!--l. 323--><p class="indent" > This menu groups operations which apply only to
images.
<dl class="description"><dt class="description">
<span
class="phvb7t-x-x-80">New</span> </dt><dd
class="description">Makes a new image. <span
class="phvr7t-x-x-80">Region on Image </span>makes a new
region, arrow, guide or mark on an image. It’s
usually easier to open a viewer on an image and
Ctrl-drag.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Convert to Image</span> </dt><dd
class="description">Try to make an image out of anything.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Format</span> </dt><dd
class="description">Switch between the various precisions.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Header</span> </dt><dd
class="description">Try to change or examine the image header in
various ways.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Cache</span> </dt><dd
class="description">This caches an image in RAM. Use this to save
the results of a long computation.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Levels</span> </dt><dd
class="description">Various tools that change the levels in an image.
<span
class="phvr7t-x-x-80">Tone Curve </span>is the only complex one: it lets you
adjust the image levels with a set of sliders.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Transform</span> </dt><dd
class="description">Various tools that change the geometry of an
image.
<!--l. 353--><p class="noindent" >To use <span
class="phvr7t-x-x-80">Rotate </span>/ <span
class="phvr7t-x-x-80">Straighten</span>, mark an arrow on an
image (Ctrl-drag up and left in an image view
window) along a near-horizontal or near-vertical
edge. When you click on <span
class="phvr7t-x-x-80">Rotate </span>/ <span
class="phvr7t-x-x-80">Straighten</span>, <span
class="phvr7t-x-x-80">nip2</span>
will rotate the image by the smallest amount that
makes that edge exactly horizontal or vertical.
<!--l. 359--><p class="noindent" ><span
class="phvr7t-x-x-80">Linear Match </span>takes two images and rotates and scales
the second so that the images can be superimposed.
Drag the tie-=points to mark common features.
Use <span
class="phvr7t-x-x-80">Filter </span>/ <span
class="phvr7t-x-x-80">Overlay </span>or <span
class="phvr7t-x-x-80">Filter </span>/ <span
class="phvr7t-x-x-80">Colourize </span>to actually
superimpose them. <!--l. 364--><p class="noindent" ><span
class="phvr7t-x-x-80">Rubber Sheet </span>is useful for fixing things like lens
distortion. You give <span
class="phvr7t-x-x-80">Find </span>two images, a reference
and a distorted version of that reference, and it
automatically finds a transform which will map the
distorted image back on to the reference image.
Use <span
class="phvr7t-x-x-80">Apply </span>to apply the discovered transform to
another image.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Band</span> </dt><dd
class="description">Extract/insert/delete image bands. Use <span
class="phvr7t-x-x-80">To</span>
<span
class="phvr7t-x-x-80">Dimension </span>to change image bands into a horizontal
or vertical dimension. Use <span
class="phvr7t-x-x-80">To Bands </span>to compress the
horizontal or vertical dimension into bands (small
images only!).
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Crop</span> </dt><dd
class="description">Crops an image. It’s often easier to drag out a
region. This menu item is only really useful for
cropping large groups of images.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Insert</span> </dt><dd
class="description">This takes two images and pastes the smaller into
the centre of the larger. The two images have to
have the same number of bands. If you open an
image viewer on the large image, you’ll see an area
which you can drag around to set the exact insert
point.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Select</span> </dt><dd
class="description">Draw elipses and polygons on an image. Useful
for selecting defined areas.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Join</span> </dt><dd
class="description">Use to join two images together bandwise,
left/right or up/down. <span
class="phvr7t-x-x-80">Array </span>joins a list of lists of
images together into a single large image.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Tile</span> </dt><dd
class="description">Repeat an image horizontally and vertically to
make a larger image, or chop an image into a set of
tiles.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Patterns</span> </dt><dd
class="description">These items all make useful images for you,
from checkerboards to gaussian masks. <span
class="phvr7t-x-x-80">XY Image</span>
is the most useful: you can use it to build other
patterns.
</dd><dt class="description">
<span
class="phvb7t-x-x-80">Test Images</span> </dt><dd
class="description">These items make a variety of useful
testcharts for evaluating spatial response and
colour.
</dd></dl>
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