| "Xylograph" plug-in filter |

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# Xylograph plug-in filter "Xylograph" term stands for a technique of printing by engraved wood plates. The resulting print often shows the wood texture. "Xylograph" plug-in filter allows you to apply a wavy halftone effect with the screen lines angle being gradually changing from shadow to highlight image area. The effects produced with "Xylograph" plugin vary from simple woodcut texture to a hand-drawn halftone screen found it many engravings.
| The filter operates by dividing the full image tone range into user-defined anount of "zones" and then applying the halftone screen, changing the lines angle from one zone to another by "Lines drift" factor. This way the halftone pattern will be drawn at different angles for shadows, midtones and highlights. Full control over halftone screen geometry (density, angle, curvature), source smoothing and tone range, lines color and transparency and overall effect intensity and apply mode make this plug-in filter extremely flexible.
Seamless image processing implemented in Xylograph allows you to easily give your webpage background an unique touch without destroying its seamless nature:
Tech note: some users wondered why several controls (line angle, for example) sometimes do not work smooth; instead, they start to work "stepwise" meaning that, say, angle changes only by some fixed increment. "This is not a bug - it's a feature!" This happens when you activate "Wrap around" option. For the resulting image to be seamless, the line egdes should match. Say, as you rotate the lines with "Line angle", the left edge of the line number N should be at the same height as the right edge of the line N+1 or N+2 or, say, N+10. It cannot be between N+9 and N+10 if we want to "make ends meet" as we use the image for a background texture. This is why the filter forces the lines to be rotated only by some "allowed" angle (the angle step depends on line dencity: the more the density is, the smaller steps are allowed). If you switch "Wrap around" off, the line rotation will become smooth as usual.

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