Tip from Ivan Louette
Clipview doesn't take account of the brush applied to the clipping shape. There is an alternative which preserves interactivity in most cases, but particularly with bitmaps.
1° create a document with two layers + a guide layer,
2° put one copy of your image (or your vector objects) in guide layer and another in layer 2,
3° apply bleach transparency 100% to the copy in layer 2 (it disappears),
4° lock layer 2 and guide layer,
5° draw a shape with black fill and outline in layer 1 (bitmap re-appears inside your shape and on your outline), here I used an irregular brush stroke (see above right).
6° now you can edit your shape, modifying brush width and other settings.
7° When you are satisfied, lock and hide layer 2,
8° unlock guide layer and select the red dotted line quadrangle,
9° create a bitmap copy WITHOUT ALPHA CHANNEL; now you have your black shape well centered in the quadrangular bitmap.
10° open the bitmap gallery and drag and drop a copy of your first bitmap on your page,
11° while keeping it selected, select the black shape bitmap in the gallery and click on "transparency".
12° to avoid some disturbing lines on the edges of your bitmap, go to transparency tool and select single tile in the status bar.
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