Selective masking case 1

<table border=1> <tr> <td>Layers</td> <td><b>Polys</b></td> <td><b>Lines</b></td> <td><b>Points</b></td> <td><b>Labels</b></td> </tr> <tr> <td>Symbol layers</td> <td></td> <td><b>0</b>: black roads <b>1</b>: yellow roads</td> <td><b>0</b>: black jets <b>1</b>: orange jets <b>2</b>: other black jets</td> <td></td> </tr> <tr> <td>Masks</td> <td></td> <td></td> <td></td> <td>A buffer that masks <b>Lines/0</b> <b>Points/0</b> <b>Points/2</b></td> </tr> <tr> <td>First pass</td> <td></td> <td></td> <td></td> <td></td> </tr> <tr> <td>Mask image (still in first pass)</td> <td></td> <td></td> <td></td> <td></td> </tr> </table> <table border=1> <tr> <td>Second pass</td> <td><b>Lines</b> without <b>0</b> </td> <td><b>Points</b> without <b>0, 2</b> </td> </tr> <tr> <td>Composition with mask</td> <td></td> <td></td> </tr> <tr> <td>Second pass image <b>inside</b> mask</td> <td></td> <td></td> </tr> <tr> <td>First pass image <b>oustide</b> mask</td> <td></td> <td></td> </tr> <tr> <td>Updated first pass image</td> <td></td> <td></td> </tr> </table>

Final image