Manual

June 2004 Isis® Sonar User's Manual, Volume 2

E.6.3 Threshold

The Threshold slide bar allows you to adjust the level of contrast stretching.

When the box is positioned at the left side of the bar, no thresholding is

applied. Maximum thresholding is applied when the box is at the right side of

the bar. If you put a check mark in the

Reverse Colors box, the colors

reverse. The Threshold window can also be summoned by right-clicking on

the contact in Target.

E.6.4 Pan Left, Right, Up or Down

When a contact image is displayed at an expanded scale (any scale other

than 1x), the window remains the same size and only a portion of the image

is visible at any one time. Use the Pan commands to move the window over

the expanded image. The arrow keys provide keyboard shortcuts for the

four pan keys.

When a measurement is made in an expanded image, the display window is

automatically centered on that measurement.

E.7 Format of TGT and CON Files

The TGT and CON types of files of the Target utility are identical in format and

are composed of four types of records, or structures:

• a structure that gives the Target utility 16-bit and 32-bit compatibility

• a header structure (

cinfo)

• an image structure, and

• a telemetry structure (

telemetry)

That format is shown in Table E-7. Varieties of data types are used to represent

the structural elements according to the purpose of the elements. The

programming conventions used to represent the various data types are the same

as those used for the XTF format (Appendix D).

Appendix E: Using the Target Utility