- Inkscape Devel - Inkscape Mailman

Inkscape.org now using oauth2 for google
by Martin Owens 23 Feb '15

23 Feb '15

Dear Developers and docs, Please be aware that because google are decommissioning their openid services, we've moved the inkscape.org social auth login from openid to their oauth2 service. If you have trouble logging in using the new service, or find that when you do, you have a new account instead of your original one. Please let me know. Martin,

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Fwd: Automatic pixel art cleaning
by Krzysztof Kosiński 22 Feb '15

22 Feb '15

I finally have something that mostly works. Attached are example input and result. The algorithm I designed works as follows: 1. Compute a sum of Fourier transforms of each row and each column of the image. 2. For both sums, look for the 'base frequency', i.e. the size of the pixel grid. There are two variants here: if the pixel art does not have grid lines, the base frequency is indicated by periodic values very close to zero ("antipeaks"), and if it does, there are periodic peaks. Spacing between peaks / antipeaks corresponds to the number of pixels. I use an empirically derived scoring scheme. 3. Sample the image at the center of grid points. Currently I use bilinear sampling at the center of the pixel, but something more clever would be better to remove defacements. For instance, doing cluster analysis and picking the average of the most numerous cluster should work. 4. Quantize colors. I wanted to avoid having to specify the number of colors in advance, so I used single-link clustering in Lab color space. Complete-link would probably work better. 5. Output the resulting image as PNG. The only tunable value in the algorithm is the clustering diameter; everything else is automatic. A value of deltaE = 8 seems to work fairly well. The algorithm works very well if the following conditions are met: 1. Pixel size is at least 5-6. 2. Image borders are aligned with the pixel art grid. 3. There is no skew or other deformation of the image. We can handle small pixel sizes, e.g. 2-5, by simply checking whether the art pixels given by these grid parameters contain approximately uniform colors. Limitations 2 and 3 could be lifted by preprocessing the image before the FFT step. The Python script posted earlier in this thread can detect the edges of the pixel art, but it doesn't work well in some cases, for example in the case of sketches where the individual squares have jagged edges. However, I think the approach of doing a Hough transform to detect lines and then finding a projective transformation that straightens the image could be promising. Another idea is to find areas of approximately uniform color, mark them using something like flood fill, and then process the edges. I will soon post the code publicly and then integrate this into Inkscape as an optional step in the Trace Pixel Art dialog, but can't give an ETA yet. I think late March is realistic for integration. I will need to factor out a few things which are more universally useful, e.g. conversion to Lab color space and color quantization, or use an external library such as Babl or LCMS. Regards, Krzysztof

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Needed: Hackfest Coordinator
by Bryce Harrington 21 Feb '15

21 Feb '15

We'll be having a hackfest for the 3 days prior to the Libre Graphics Meeting in Toronto. I'd like to put out a call for a volunteer to serve as event coordinator for this. Responsibilities will include coordinating expense reimbursements, liaising with the LGM coordinators, and handling other misc. tasks that come up. I'll be attending and will be available to help, but I'd like to focus more on technicals so would appreciate a dedicated events person. Contact me off list if interested and we'll sort out details. Bryce

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Needed: Board Executive Secretary volunteer
by Bryce Harrington 21 Feb '15

21 Feb '15

We're about to enter a busy period for the board. We've got the hackfest coming up, a new charter to decide on and document, a board election to hold, and more. I'm finding myself to be a bit of a bottleneck for proceeding on these items - partly due to a need to ensure everything's properly documented. At Martin Owen's suggestion, I'd like to ask for a volunteer to help me out with various documentarian tasks, such as: * posting news items to the website about board activities * formatting documents into HTML for the website * uploading PDF documents to the website * ensure meeting minutes are posted * drafting vote proposals * copyediting You'll be working closely with me. I don't think it is going to require a huge time commitment - perhaps several hours a week - but I do need someone I can hand stuff off to and rely on to ensure it gets done. In particular, you'll be helping me build out the Governance area of our main website (under the About menu), with various legal documents, policies, procedures, financial docs, meeting minutes, and so on. If you're interested, please contact me off list. Thanks, Bryce

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Tarballs for trunk
by Ryan Lerch 21 Feb '15

21 Feb '15

I semi-regularly build trunk versions of Inkscape for Fedora, and as part of this process, I generate the tarballs using "make dist". I am now uploading these generated tarballs to here: http://inkscapetarballs.ryanlerch.org/ for people to use. Note that these arent auto-generated or nightly by any stretch of the imagination, but will just appear there when i run a new trunk build for Fedora. cheers, ryanlerch

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Transformation center issues
by Diederik van Lierop 20 Feb '15

20 Feb '15

Hi people, The past weeks I've been trying to fix some transformation center offset regressions, which were caused by the new unit/viewbox stuff. That should all work reasonably well again, but it remains a headache. IMHO this transformation center handling is broken by design, and judging by some comments in the code I'm not the only one to think so. It requires all kinds of special casing everywhere transformations are being applied, due to the transformation center being expressed in horizontal/vertical coordinates, relative to the center of the bounding box. Does anybody know why it was designed like this? If there are no strong objections, then I'd propose to use absolute coordinates, and to apply transformations as if it were simply a point of a path. This would make code much cleaner. We will no longer need to call document->ensureUpToDate() to force an update of the bounding box everytime the center is requested or changed. It might also allow us to get rid of the weird behavior of the transformation center (which should rotate with the item in case an object is rotated!) Not that I'm going to change this now, but I might get to this after the 0.91 release. Diederik

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Inkscape Mailing List Migration
by Martin Owens 20 Feb '15

20 Feb '15

Hi Devs, In the process of moving away from sourceforge, we have OSOUL on stand by to create replacement mailing lists for us. In order to do this, we need archives. Of course this would create a forking point for each of the lists. The process works like this: * Get the admins on sourceforge give me admin privilages to all existing mailing lists. * A script to take subscriber lists and archive mboxes out is prepared. * The OSOUL ticket for making mailing lists requires them to join irc for some immediate actions. * Once the new list is online, the old one is disabled and a message is sent out to everyone on the list. * A new message is sent out on the new list. Does this make sense? Do you have any ideas? Martin,

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[karen@...3057...: last chance to apply to GSoC]
by Bryce Harrington 20 Feb '15

20 Feb '15

----- Forwarded message from Karen Sandler <karen@...3057...> ----- Date: Fri, 20 Feb 2015 01:29:04 -0800 From: Karen Sandler <karen@...3057...> To: project-reps@...3057... Subject: last chance to apply to GSoC Reply-To: karen@...3057... Just a friendly reminder that the deadline for orgs applying to GSoC is today, February 20 at 19:00 UTC! http://www.google-melange.com/gsoc/homepage/google/gsoc2015 karen ----- End forwarded message -----

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SVG Working Group - Sydney report
by Tavmjong Bah 20 Feb '15

20 Feb '15

Hi, I have posted a report from last weeks SVG face-to-face meeting in Sydney: http://tavmjong.free.fr/blog/?p=1226 It was a very successful meeting: * We worked through many of the remaining issues on auto-flowed text with the participation of the CSS working group. * My proposal for text-on-a-shape was approved. * My proposal for 'auto-closing' of curved paths was approved. * My proposal for 'auto-smoothing' of mesh gradients was approved. * A new "clipped' miter line-join was approved. (Instead of falling back to a bevel line join when the miter-limit is exceeded, the line-join is clipped at the limit.) * How the miter-limit effects the arc line-join was decided. * We resolved most of the important issues blocking moving the SVG 2 spec to the next stage of the specification process and targeted the next face-to-face meeting in June for making the transition. * None of the important features for Inkscape were removed from the core SVG 2 specification (except marker knockouts which still needs a lot of work). Tav

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Wiki account
by Bit Barrel 20 Feb '15

20 Feb '15

Can someone acquainted with the force make an inkscape wiki account for me? It gives me this mesage: "To request an account please email the developer list". I want to update this page as it is totally out of date and broken: http://wiki.inkscape.org/wiki/index.php/Using_Eclipse

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