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This acts like the Draw Scale command in NIH Image, which places
a gray scale (or color) ramp on the image for use as a scale bar. After
the command is selected, a cross cursor will appear, and the front gray
scale image window will be 'popped' to the front. Drag a rectangle to define
the size of the ramp. As in NIH Image, the ramp may be either horizontal
or vertical which ever dimension is greater, and will increase either to
the right or up.
Dragging the rectangle sets the :crop_bdr parameter, and places the yellow
rectangular border around the scale. This rectangle can be removed
in various ways.
Currently, there is NO provision for annotating this scale. Use PowerPoint
or Photoshop, for example for annotation.
Draw Scale appears under two buttons:
- Edit button (permanent)
- As in NIH Image, the values are 'burned into' the image data.
- The ramp values range linearly from the image minimum to the image
- Since the ramp becomes part of the data,
- It WILL be saved if the image is saved.
- It WILL be rescaled if the image is rescaled, so that various colors
or gray levels correspond to the scaled image.
- For a permanent border around the scale bar, use the rect...burn
in button (before another rectangle is 'moused'. Otherwise, use the temporary
yellow rectangle before the :crop_bdr
parameter is reset.
- Color button (temporary)
- Unlike NIH Image, the ramp is drawn onto the scaled copy of the image
that is used for display.
- The ramp will disappear next time the image is rescaled.
- The ramp will NOT be saved if the image is stored. Of course, the ramp
is saved in a screen grab.
- The yellow rectangular border is not part of the image data (just as
the ramp is not) but will stay around the ramp until either:
- The gray levels will follow that of the displayed image when using
the contrast and false color slider bars.