The effect below was generated from the picture at 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. Here again 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. and then with 16 colors and 0 pixel point reduction vectorized. Original picture transformed with the Poster filter and 64 colors … Original picture with 16 colors and 0 Pixel point reduction vectorized The Tile size option allows the width in pixels of the width of these square areas to be preset. If the Fill holes option is marked, additional square, tiled areas are created with a background color the same as the hole. Point reduction can result in small areas or “holes” which are not covered by a polygon. The section of the picture below, highly magnified, shows that with a larger point count small flecks of color-typical of irregular color patterns-simply disappear. Polygons will only be created if they have a size greater than the value given in this setting. It is worthwhile to try reducing the number of colors by changing the color depth or with the Poster filter.
The algorithm used in the reduction of the number of colors is not yet optimal. These polygons are then filled with the relevant color. For every color occurring in the picture, Draw creates a polygon the polygon may in fact consist of several disconnected parts. The picture can, however, contain fewer colors. Because graphics conversion can take some time, depending on the picture and the computer, a progress bar is included at the bottom of the dialog (see Figure 11).įigure 11: Conversion of a picture to polygonsĭraw considers between 8 and 32 colors in the conversion. The Preview button generates a preview of the conversion with the current settings. The conversion begins with the Convert to Polygon dialog, where a number of settings can be defined. The total image effectively becomes a vector graphic and can be resized with no loss of image quality. This command creates, from areas of the same color, a number of small polygons filled with color. From the context menu or from the Modify menu, choose Convert > to Polygon. Select the picture so that you see the green handles.
The polygon offers you in any case a number of possibilities for further change: modify shape or define transparency gradient. The polygon is in fact a vector graphic but the picture remains as a bitmap image. All your modifications must be completed before this point. In this state you are not able to further edit the graphic. This command creates from the original image a polygon or group of polygons, with 4 corner points and the image set as a background graphic. From the context menu or from the Modify menu choose Convert > to Contour.
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