Hi, That's a great idea. The idea would be to have only on foreground selection tool and make it automatically determine whether to use Magic Wand or SIOX (btw.: not spelled like the native American tribe). This shouldn't be very hard since Magic Wand's user interaction is a subset of SIOX user interface. The determination whether to use one or the other could depend on the amount of colors that are found in the user-defined foreground sample. There might be a radio-button to override the automatic choice. Any volunteer? Maybe it's for Google Summer of Code 2010... Gerald On Fri, Sep 18, 2009 at 5:02 PM, SorinN <nemes.sorin@xxxxxxxxx> wrote: > But probably - if we can try to identify some generic use cases and > then to identify a sum of possible techniques / technologies to solve > those different cases, we can put a base for a future meta tool. > > GIMP has already some useful tools such as color to alpha, and color > erase (for brushes), also Gmic has color replace. Maybe if we can have > the posibility to pick (with a picker) which color is important to > remain and then to pick which color (or range of colors) can go to > aplha (probably with a color tolerance control [based on luminance, or > other factors]), we can have a better precision for this (meta)tool, > and saving a lot of time. > > This can go well in SIOUX tool. The same tool as is now but with some > [+] color and [-] color selectors / pickers - which will manually > refine the alghorithm after the initial selection is done (as is now > in SIOUX). When the color selection manually refined is ready, our > SIOUX based tool will know much better (if not exactly) about our > intention, about which color is important and which is not. > > > 2009/9/19 Gerald Friedland <fractor@xxxxxxxxx>: >> Hi Alex, >> >> Background extraction IS indeed tricky. >> >> First, different pictures require different tools. Everything where >> the foreground color is essentially one color, such as drawings will >> work best with a tool like Magic Wand. The foreground extraction Jenny >> was improving is intended to be used on photographs and works best >> when the fotograph features a clearly distinctive foreground but the >> foreground can easily contain millions of colors and as of now, the >> foreground can also have very fine structure. There is virtually no >> tool that can deal with transparencies, reflections, and other nasty >> stuff. When extracting objects with these issues you have to be lucky. >> >> Second, the way to think of these semi-automatic extraction tools is >> to compare them with a dish washer. Very often, the dish washer will >> do a good job and clean your dishes. So it'll save you work and it'll >> be cleaner than if you'd done it manually in the same time. However, >> for some pieces, the dish washer just doesn't work. Often these are >> the pieces that are particularly difficult, sometimes though you ask >> yourself: Why is this glass still dirty -- it's like all the other >> glasses? So there are people who do not want a dish washer because >> they want to be in absolute control of the cleaning process. However, >> would you stop producing, selling, using, and improving dish washers >> in general, just because they don't work always? The answer is of >> course: No because in sum they are useful. >> Same with automatic foreground extraction methods: For some images >> they save a lot of work, for others they might cause trouble. Some >> people will never use the tools because they want to be in complete >> control of the segmentation process. In sum they are useful though. >> >> Gerald >> >> On Thu, Sep 17, 2009 at 10:57 PM, Alexandre Prokoudine >> <alexandre.prokoudine@xxxxxxxxx> wrote: >>> On Fri, Sep 18, 2009 at 2:34 AM, SorinN wrote: >>>> Well, every background extraction is tricky - I tried PhotoshopCS 4 >>>> tools - they seems to be trivial to use and seem to be easy - but for >>>> a complex task which need a lot of pixel precision you have to do a >>>> lot of manually corrections too so the final feelig is a kind of >>>> frustration - (with gimp magic wand progresive selection feature [drag >>>> over layer left / right], I can do the same thing quicker). >>> >>> Are you talking about >>> http://help.adobe.com/en_US/Photoshop/11.0/WSFD9BA8C5-31BA-4fec-81F3-CF04EE5295FCa.html >>> ? >>> >>> Alexandre >>> _______________________________________________ >>> Gimp-developer mailing list >>> Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx >>> https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer >>> >> >> -- >> Dr. Gerald Friedland >> International Computer Science Institute >> 1947 Center Street, Suite 600 >> CA-94704 Berkeley, USA >> http://www.gerald-friedland.org >> _______________________________________________ >> Gimp-developer mailing list >> Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx >> https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer >> > > > > -- > Nemes Ioan Sorin > -- Dr. Gerald Friedland International Computer Science Institute 1947 Center Street, Suite 600 CA-94704 Berkeley, USA http://www.gerald-friedland.org -- Sent from Berkeley, CA, United States _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
