September 2012 - Inkscape Devel

Creating color managed PDFs
by Adrian Johnson 12 Sep '12

12 Sep '12

I have been working on an experimental branch of cairo that supports color management for the image and pdf surfaces. I'm currently trying to get Inkscape to use this API so I can test creating color managed PDF files. I'm not familiar with SVG or the Inkscape source and have some questions. The SVG specification says that compositing can be performed in sRGB or linear RGB color space. I could not find where this is supported in Inkscape. For now I've set the PDF surface color space to sRGB. What color space are gradients interpolated in? Are all gradient stops the same color space? In my patch I have assumed that all stops have the same color space and used this color space as the interpolation color space. Can a color space be set for an image? If anyone is interested the code is here: http://cgit.freedesktop.org/~ajohnson/ To simplify the implementation only RGB color spaces are currently supported.

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Talks for SVGOpen (the graphical web).
by Tavmjong Bah 11 Sep '12

11 Sep '12

Hi, I've posted drafts of my talks for SVG Open 2012 (now known as "The Graphical Web") to my website. Comments welcomed. I give both talks Tuesday morning in Zurich. The talks use JessyInk and require you to hit Page Down twice to get to the first slide. Firefox messes up some figures while Chrome doesn't do indenting text spaces well. Inkscape Update: http://tavmjong.free.fr/SVG/SVGOpen2012/INKSCAPE_2012/svg_2012_inkscape.svg SVG 2 For Artists: http://tavmjong.free.fr/SVG/SVGOpen2012/ARTISTS/svg_2012_artists.svg Tav

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Eraser
by Jabiertxo Arraiza Cenoz 10 Sep '12

10 Sep '12

Hello. I have realized that an extension inkscape, by means of filters and clones makes some other deleted objects in overlapping parts, something also cut live. The problem is quite complicated and the resulting svg uses a filter that erodes quality minimally deleted edges, which I think would be invaluable in print because you have to maximum zoom to see the difference of pixelization. Researching upcoming SVG specification have seen that the primitive blend filter-I-will have to incorporate a new method that is draft. I understand it's a little early to incorporate it into inkscape, but it occurred to me that if you could add a new element to inkscape namespace for the element that contains all Scrap right of the lower elements of the group. More could be done adelate this namespace be reflected in any svg renderer thanks to the new way of blend filter primitive. Now I'm starting with B-Spline extension but I think this is a good thing for inkscape, and they can see how it works if you install the extension in the latest stable version, is not urgent since no alternative but can be interesting look. The extension is set in inkscape forums with a link to the website of my company and a donation button if any millionaire out there . http://www.inkscapeforum.com/viewtopic.php?f=11&t=12517 ------------------------------------------------------------------------------------ Yo he realizado una extensión en inkscape que, por medio de filtros y clones hace que unos objetos borren a otros en las partes coincidentes, algo asi como un recorte en vivo. El problema es que complica bastante el svg resultante y hace uso de un filtro que hace perder minimamente la calidad de los bordes borrados, cosa que considero que sería inapreciable en impresion ya que hay que hacer un zoom máximo para apreciar la diferencia de pixelización. Investigando la próxima especificación de SVG he visto que la primitiva de filtro mezclar -creo- va ha incorporar un nuevo metodo que se trata de borrador. Entiendo que es un poco pronto para incorporarlo a inkscape, pero se me ha ocurrido que si se podria añadir un nuevo elemento al espacio de nombres de inkscape para que el elemento que lo contenga haga de borrrador de todos los elementos inferiores de su grupo. Más adelate se podria hacer que este namespace se reflejase en cualquier renderizador de svg gracias a el nuevo modo de la primitiva de filtro mezclar. Yo ahora mismo estoy empezando con la extensión B-Spline pero considero que esta es una buena cosa para inkscape, y ademas pueden verla en funcionamiento si se instalan la extension en la última versión estable, no es algo urgente ya que hay alternativa pero puede ser interesante mirarlo. La extensión está puesta en los foros de inkscape con un enlace a la web de mi empresa y un boton de donación por si hay algún millonario por ahi. http://www.inkscapeforum.com/viewtopic.php?f=11&t=12517

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Re: [Inkscape-devel] B-Spline
by Jabiertxo Arraiza Cenoz 10 Sep '12

10 Sep '12

Good morning. I am very glad that people are getting involved in the project. I thank especially Arshdeep Singh for offering with such enthusiasm, I look forward to working with him and learn. I am also happy news for the project provided by Johan Engelen lib2geom of the project, which seems key to the achievement of the B-Splines in Inkscape. For my part I contribute my part of the way and start coding before I point out what I think we need to get. The BSplines give the artist total control to make layouts without using handlers, giving a speed and accuracy, I think, unique in the world of drawing. This feature is primarily patent while you draw each stroke, implement this feature at the end of the path has no make much sense. I therefore propose branch-if so-called the project into two consecutive parts: The first is a part facilitator also has benefits spiro tool. They are getting while drawing a spiro curve, the mark of the "road" is already the final route, without going into consideration to show both paths and / or buttons to switch. The second would be to implement a curve BSpline like a Spiro. In both modes "spiro" and "BSPLINE" would be important to assign a key to draw the next point is a corner point. Do you think well this way? ------------------------------------------------------------- Buenos días. Estoy muy contento de la gente que se está involucrando en el proyecto. Le doy gracias especialmente a Arshdeep Singh por ofrecerse con ese entusiasmo, estoy deseoso de poder trabajar junto a el y aprender. Me alegra también la noticia a favor del proyecto facilitada por Johan Engelen de el proyecto lib2geom, que parece clave para la consecución de las B-Splines en Inkscape. Yo por mi parte aporto mi parte del camino y antes de empezar a codificar quiero puntualizar lo que pienso que tenemos que conseguir. Las BSplines dan al dibujante total control al realizar trazados sin necesidad de usar manejadores, dando una velocidad y precisión únicas -creo- en el mundo del dibujo. Esta característica es patente principalmente mientras se va dibujando cada trazo, implementar dicha característica al final de realizar el trazado no tiene mucho sentido. Por ello propongo bifurcar -si se llama así- el proyecto en dos partes consecutivas: La primera es una parte facilitadora que además tiene beneficios para la herramienta spiro. Se trata de conseguir mientras se dibuja una curva spiro, que la marca del "camino" sea ya el trazado final, sin entrar en consideración de mostrar ambos trayectos y / o botones para alternar. La segunda seria implementar la curva BSpline como una Spiro. En ambos modos "spiro" y "bspline" seria importante asignar una tecla para que el siguiente punto a dibujar sea un punto de esquina. ¿Os parece bien este camino?

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Fwd: B-Spline
by Arshdeep Singh 10 Sep '12

10 Sep '12

---------- Forwarded message ---------- From: Arshdeep Singh <moduli16@...400...> Date: Sun, Sep 9, 2012 at 12:27 PM Subject: Re: [Inkscape-devel] B-Spline To: jabier.arraiza@...2893... I am a computer graphics enthusiast who loves mathematics. The idea of implementing B-Splines seems really cool. I am proficient in C/C++. And I am doing a course in college that covers the basics of Beizer Curves and B-Splines. Can I be of any help ? On Thu, Sep 6, 2012 at 7:09 AM, Jabiertxo Arraiza Cenoz <jabier.arraiza@...2893...> wrote: > According council go Gronde Jasper I decided not to do before an > extension in Python. I created a branch in Launchpad called B-Spline. > > As I want to make it work with the tool Beizer I have a problem. This is > the result I want to see while drawing tool like calligraphic strokes. > > Subtraction accurately understand this if, for example, stroke is the > width or has a color similar to background. From what I see important > that the line where the stroke will go, once completed, should continue > as a curve or BSPLINE spiro and not currently a curve Beizer. > > For as designed the efect that are updated live to close the path not > know if this is possible or not. Does anyone know? > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Inkscape-devel mailing list > Inkscape-devel(a)lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/inkscape-devel -- Arshdeep Singh Third Year, Computer Engineering Delhi Technological University Ph: +91-9654115614 -- Arshdeep Singh Third Year, Computer Engineering Delhi Technological University Ph: +91-9654115614

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Re: [Inkscape-devel] Color Management Doesn’t Seem to Work
by Jason Simanek 09 Sep '12

09 Sep '12

Thanks for the response. On 09/09/2012 10:43 AM, S.Kemter wrote: > The CM functionality in Inkscape means screen proof and adding the > profile to the svg, as the standard supports this. It doesn't seem to be giving me an color managed screen proof though. If I fill a square with a hexadecimal value in Inkscape and fill a square with the same value in Gimp, on screen they look like two different colors. > For export to png Inkscape uses cairo and that doesnt support this > feature. This is unfortunate, but as long as I am primarily working in sRGB this is still usable for created screen/web graphics. Thanks again. Jason Simanek

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Color Management Doesn’t Seem to Work
by Jason Simanek 09 Sep '12

09 Sep '12

Hi, I'm trying to nail down a color managed workflow for my design work (print and web). I am running Inkscape Trunk on Ubuntu 12.04. I can't seem to get Inkscape to output color managed colors. For a test I export my Inkscape artwork as a PNG and open the resulting PNG in Firefox (with full color management turned on) as well as Gimp (with color management turned on). My laptop display has been calibrated with a colorimeter via colord/Argyle. I have assigned this display color profile in both Gimp and Inkscape preferences. The colors in my graphic should match in all three applications, but Inkscape is obviously showing over-saturated colors while Gimp and Firefox match exactly. Am I doing something wrong? Is color management in Inkscape not really working correctly yet? Any help is much appreciated. Jason Simanek

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Shared library
by Alex Valavanis 07 Sep '12

07 Sep '12

Hi All, I'm not an expert on this kind of thing, but is there a reason why we don't distribute libinkscape as a shared library? At the moment, Inkscape and Inkview share a huge amount of code and they are both pretty big executables. Presumably, we'd save a lot of installation space with a shared lib. AV

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Re: [Inkscape-devel] B-Spline
by Jabiertxo Arraiza Cenoz 06 Sep '12

06 Sep '12

According council go Gronde Jasper I decided not to do before an extension in Python. I created a branch in Launchpad called B-Spline. As I want to make it work with the tool Beizer I have a problem. This is the result I want to see while drawing tool like calligraphic strokes. Subtraction accurately understand this if, for example, stroke is the width or has a color similar to background. From what I see important that the line where the stroke will go, once completed, should continue as a curve or BSPLINE spiro and not currently a curve Beizer. For as designed the efect that are updated live to close the path not know if this is possible or not. Does anyone know?

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Re: [Inkscape-devel] B-Spline
by Jabiertxo Arraiza Cenoz 05 Sep '12

05 Sep '12

Traductor inkscape create a path effect In the attached document on the B-splines, especially in point 4, I read the way a cubic Beizer curve, generate another curve to follow another path to simulate a curve B-Spline. At this point I find doubts. I understand that the ideal is that the system works as curbas Spyro. The Spyro curbas are really a "LIVE PATH EFFECT". My ask is: I have doubts if start is better here or a different starting point and go directly to the "live path effects" My current point is: develop it as an extension in Python that from a path, create another with the path I should follow BSPLINE for points and handles used in the original path. Moreover Barendrecht Pieter offered me another way with groups but do not understand. Thanks Peter. Thank you very much in advance for their cooperation.

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