IMGTRACK

Redisplays a loop of images centered at a selected feature.

Format

IMGTRACK [keyword]

Keyword

MAG=

lmag emag

line and element magnification factors to use when the images are redisplayed; see the Remarks (default=1 lmag)

Remarks

IMGTRACK marks a feature on each frame of a loop set with the LS or LB command, then it uses the IMGDISP command to redisplay the images with the feature at the center of each frame. Use IMGTRACK to show a Lagrangian display of a moving feature.

The MAG keyword is used to increase or decrease the resolution when the images are redisplayed. The factors specified in MAG are relative to the originally-displayed image's resolution, not the image file's resolution. Thus MAG keyword values greater than 1 produce a blowup of the displayed image, and values less than 0 produce a blowdown. MAG=1 (the default) redisplays at the same resolution.

Examples

IMGTRACK

This entry prompts you to step through each frame of the current loop, marking the desired feature by moving the cursor to the feature's location and pressing the middle mouse button. When you've stepped through all the frames in the loop, press Alt G to redisplay the images with the feature at the center of each frame. Then press Alt Q or the center and right mouse buttons to exit the program.

IMGTRACK MAG=3 2

This entry is the same as the one above, except that it uses a line blowup factor of three and an element blowup factor of two when redisplaying the images.

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