MeasureTool » History » Version 4

Chris Cannam, 2013-03-05 10:49 AM

1 1 Chris Cannam
h1. About the Measure tool and its limitations
2 1 Chris Cannam
3 1 Chris Cannam
The Sonic Visualiser Help reference "describes the Measure tool":http://www.sonicvisualiser.org/doc/reference/2.0/en/#measurements like this:
4 1 Chris Cannam
5 4 Chris Cannam
> The measure tool enables you to obtain measurements in scale units (such as time in the X coordinate, or whatever the Y coordinate of the current layer represents) corresponding to certain pixel positions. To measure a region, just click and drag a rectangle covering it, using the left mouse button with the measure tool selected...
6 4 Chris Cannam
> It's important to note that the measurements shown in this way are based entirely on the pixel coordinates of the measurement rectangle, not on properties of the data being displayed.
7 2 Chris Cannam
8 2 Chris Cannam
The measure tool also has the ability to produce an automatic bounding box for a graphical feature (when double-clicked):
9 2 Chris Cannam
10 2 Chris Cannam
> The area enclosed by the rectangle is based on the extent of similarly-coloured pixels surrounding the click position: it is entirely graphical, involving no audio analysis, and so depends on the gain and colour scheme in use in the spectrogram.