Controls

The controls common to all GME plug-ins are described below. They are grouped into two sections:

• Ones that determine how analysis is carried out. See Parameters That Affect Analysis.

• Ones that control the rendering of the output. See Parameters That Affect Rendering.

Parameters That Affect Analysis

The following parameters affect the analysis of the four-corner pin.

Analyse - This is a push button which triggers an analysis of the input clips and calculate a corner pin. Interrupting the analysis does not delete the corner pin keys that have already been calculated.

Render During Analysis - If set, this toggle causes the effect to update the time line and render a freshly analyzed frame so you can see the progress of the effect. Doing so slows down the analysis somewhat, so toggle this off to speed up the general analysis.

Clear Analysis - Pressing this push button deletes all keyframes from the corner pin parameters, allowing you to force a re-analysis if you feel the need to.

Analysis Range - This controls the range of frames any analysis will be run over. It can be one of:

• Specified Range - which looks at the parameters Analysis Start and Analysis Stop for the range of frames to analyze,

• Source Clip Range - which automatically determines the range of frames to analyze from the length of the input clip.

Analysis Start - The first frame to analyze from if AnalysisRange is set to Specified Range.

Analysis Stop - The last frame to analyze from if Analysis Range is set to Specified Range.

Scale - A toggle that indicates whether the calculated corner pin can include a scaling factor.

Rotate - A toggle that indicates whether the calculated corner pin can include rotations.

Translate - A toggle that indicates whether the calculated corner pin can include translations in x and y.

Perspective - A toggle that indicates whether the calculated corner pin can include perspective transforms.

Analysis Region - This is the region analyzed to calculate the four-corner pin. This is especially useful when doing any form of frame locking, in which case, go to the lock frame, look at the reference clip and position the box over the area you want locked.

• Analysis Region BL - controls the position of the bottom-left corner of the analysis region.

• Analysis Region TR - controls the position of the top-right corner of the analysis region.

Accuracy - This controls the time/accuracy trade off in the GME engine. The higher this is, the slower it goes, but you have a better likelihood of a good result.

Parameters That Affect Rendering

These following parameters control how a GME effect renders the four-corner pin. Some of them are set during the analysis pass.

Filtering - This controls the quality of the rendering.

• Low - uses nearest neighbor filtering. This gives low quality but is quick to render.

• Medium - uses a bilinear filter. This gives good results and is quicker to render than high filtering.

• High - uses a sinc filter to interpolate pixels giving a sharper repair. This gives the best results but takes longer to process.

Invert - If set, then the inverse of the calculated four-corner pin is used during render.

Four Corner Pin - The corner pins calculated during the analysis pass:

• Bottom Left - the lower left corner pin.

• Bottom Right - the lower right corner pin.

• Top Left - the upper left corner pin.

• Top Right - the upper right corner pin.