Example 4.  Colorspace YDS enhanced using area selection (yellow rectangle).  A stronger enhancement.  You must make the area selection BEFORE hitting the DStretch button.  I have left it visible so you can see the placement.  You can save the area selection using the ImageJ command File->Save As->Selection.  Then you can reproduce the enhancement by reading the saved selection before doing the stretch.

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Example 4 Saucito, Colorspace YUV, area selection