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 maximum.
  • 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 clear...graphics button is clicked, or
    • another rectangle is moused.
• Both
  • The gray levels will follow that of the displayed image when using the contrast and false color slider bars.