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+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + The standard B-splines output will give you smooth results, because the previous +Voronoi output will be converted to quadratic Bézier curves, but the conversion +won't be 1:1 because there are more heuristics working to decide which curves +will be merged into one when the algorithm reachs a T-junction among the visible +colors. A hint about the heuristics of this stage: You can't tune them. + + + + + + + + The final output exported by libdepixelize (not offered by Inkscape GUI +currently because its experimental and incomplete state) is the "optimize +curves" to remove the staircasing effect of the B-Spline curves. This stage also +performs a border detection technique to prevent some features from being +smoothed and a triangulation technique to fix the position of the nodes after +optimization. You should be able to individually disable each of these features +when this output leaves the "experimental stage" in libdepixelize (hopefully +soon). + + + + + + + + The heuristics section in the gui let you tune the heuristics used by +libdepixelize to decide what to do when it encounters a 2x2 pixel block where +the two diagonals have similar colors. "What connection should I keep?" is what +libdepixelize asks. It tries to apply all heuristics to the conflicting +diagonals and keep the connection of the winner. If a tie happens, both +connections are erased. + + + + + + + + If you want to analyze the effect of each heuristic and play with the numbers, +the best output is the Voronoi output. You can see more easily the effects of +the heuristics in the Voronoi output and when you are satisfied with the +settings you got, you can just change the output type to the one you want. + + + + + + + + The image below has an image and the B-Splines output with only one of the +heuristics turned on for each try. Pay attention to the purple circle that +highlights differences that each heuristic performs. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + For the first try (top image), we only enable the curves heuristic. This +heuristic try to keep long curves connected together. You can notice that its +result is similar to the last image, where the sparse pixels heuristic is +applied. One difference is that its "strenth" is more fair and it only gives a +high value to its vote when it's really important to keep these connection. The +"fair" definition/concept here is based on "human intuition" given the pixel +database analysed. Another difference is that this heuristic can't decide what +to do when the connections group large blocks instead of long curves (think +about a chess board). + + + + + + + + For the second try (the middle image), we only enable the islands heuristic. The +only thing this heuristic do is try to keep the connection that otherwise would +result in several isolated pixels (islands) with a constant weight vote. This +kind of situation is not as common as the kind of situation handled by the other +heuristics, but this heuristic is cool and help to give still better results. + + + + + + + + For the third try (the bottom image), we only enable the sparse pixels +heuristic. This heuristic try to keep the curves with the foreground color +connected. To find out what is the foreground color the heuristic analyzes a +window with the pixels around the conflicting curves. For this heuristic, you +not only tune its "strenth", but also the window of pixels it analyzes. But keep +in mind that when you increase the window of pixels analyzed the maximum +"strenth" for its vote will increase too and you might want to adjust the +multiplier for its vote. The original libdepixelize author think this heuristic +is too greedy and like to use the "0.25" value for its multiplier. + + + + + + + + Even if the results of the curves heuristic and the sparse pixels heuristic give +similar results, you may want to leave both enabled, because the curves +heuristic may give an extra safety that the important curves of contour pixels +won't be hampered and there are cases that can be only answered by the sparse +pixels heuristic. + + + + + + + + Hint: You can disable all heuristics by setting its multiplier/weight values to +zero. You can make any heuristic act against its principles using negative +values for its multiplier/weight values. Why would you ever want to replace +behaviour that was created to give better quality by the opposite behaviour? +Because you can... because you might want a "artistic" result... whatever... you +just can. + + + + + + + + And that's it! For this initial release of libdepixelize these are all the +options you got. But if the research of the original libdepixelize author and +its creative mentor succeeds, you may receive extra options that broaden even +yet the range of images for which libdepixelize gives a good result. Wish them +luck. + + + + + + + + All images used here were taken from Liberated Pixel Cup to avoid copyright +problems. The links are: + + + + + + + + + http://opengameart.org/content/memento + + + + + + + + http://opengameart.org/content/rpg-enemies-bathroom-tiles + + + + + + + + + + + + + + + + image/svg+xml + + + + + + + + + + + + + + + + + Use Ctrl+up arrow to scroll + + + + -- cgit v1.2.3 From 213e57fb77bd98e2120c0cec364cbdc7537863aa Mon Sep 17 00:00:00 2001 From: su_v Date: Sun, 29 Sep 2013 17:44:55 +0200 Subject: Tutorials. Add new tutorial to Makefile.am (follow-up to r12626) (bzr r12627) --- share/tutorials/Makefile.am | 1 + 1 file changed, 1 insertion(+) (limited to 'share') diff --git a/share/tutorials/Makefile.am b/share/tutorials/Makefile.am index 1b7e1a0a4..1db3a144d 100644 --- a/share/tutorials/Makefile.am +++ b/share/tutorials/Makefile.am @@ -200,6 +200,7 @@ tutorial_DATA = \ tutorial-tracing.sl.svg \ tutorial-tracing.vi.svg \ tutorial-tracing.zh_TW.svg \ + tutorial-tracing-pixelart.svg \ tux.png -- cgit v1.2.3