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Original picture transformed with the

Poster filter and 64 colors …

… and then with 16 colors and 0 pixel

point reduction vectorized.

Here the picture is transformed with the

Poster filter, but this time with a point

reduction of 4 pixels and a tile size of

16 pixels.

The effect below was generated from the

picture to the left (posterized and

vectorized); the polygons were split with

Modify > Break, and a number (in this

case 6) of the (foreground) polygons

were deleted until the resulting

background was achieved.

Note: To select polygons for deletion,

click on a curved colored area (the text

in the status bar shows “Polygon nnn

corners selected”, where nnn is the

number of corners of the polygon) and a

frame with green handles encloses the

area of the polygons selected. Press

Delete to delete the polygons. Repeat

until you have achieved the desired

effect, (which here is to have only the

background showing).

If you next ‘split’ the existing Metafile (Modify > Split), access is gained to

individual polygons. To be able to operate on these together you should immediately

group them after splitting.

With this vectorized form of the image, you can carry out operations familiar from

classic drawing programs, for example a curved warping operation. For such

transformations, it is much less effort to use a conversion with background tiles so

that the edges of the picture are straight.

Chapter 6 Editing Pictures (Raster Graphics) 107

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OpenOffice.org OpenOffice - 3.3 Guía de usuario Pagina 107