Monday, November 1. 2010How I'd like to use Twitter![]() (The following is a kind of current-state analysis, maybe leading to my long intended anti-WWW rant. Honestly, I think Twitter is a broken technology. 140 characters are way too few to provide useful context. And as URLs eat from this character pool, the urge for link shorteners simply leaves this service behind broken, IMHO. Just look at this plot of the distribution of tweet lenghts: Well, some misuse Twitter as a chat, although IRC would be the technology of choice for that. I mainly use it as a news stream. In fact, Twitter changed their orientation from individual “Took a dump, ate a banana” status updates to personalized news. Although RSS or Atom are dedicated technology for collecting headlines and articles (and keeping their read/unread state), Twitter provides a unified time flow (that passes by, no matter if you read it or not). And while RSS/Atom is a kind of pull technology (i.e. you have to look at different feeds and articles for yourself), Twitter is a push variant where all elements meld into a single data stream. The problem is, in engineering terms, there’s so much noise in the data; there’s so much irrelevancy occurring in the timeline, at least in mine. I followed more and more people, like “Hey, this guy developped that app, and there’s a link to his Twitter”, or I chose to follow various companies when I noticed they had an account at Twitter. But more and more often I asked myself where a certain guy/gal I followed actually came from. I’m wasting too much time at Twitter. Meanwhile, I’m following more than 250 people. (Yeah, I think those who follow >300 are simply nuts. How the hell do they handle their timeline? How can they claim Twitter is not a distraction?) Me wants:
Of course, a lot of this already sounds like RSS. But there are tweets that are status updates per se and don’t contain URLs. It appears to me that Twitter and RSS (and maybe the whole social *BUZZWORD ALERT* media) are becoming “the HTTP of a new WWW”: It’s up to new and upcoming user interfaces to aggregate, weight, filter, sort and manage content coming from various data streams; new user interfaces for new devices, but also for the “old scholars”. I noticed recently that things are becoming better for me when using different Twitter—or rather, aggregator—clients, like TweetDeck or My6Sense. It’s becoming important for me to not just scream or hear screams, but to consume and provide relevant information. Thursday, October 21. 2010Why I rooted my phone![]() This is just a note for myself what hacks I applied to my phone to make it more usable to me. This is to reproduce these settings once I flash the full Android 2.2 “FroYo” image onto my Motorola Milestone:
* Achieved by TimeTurn’s OpenRecovery for Milestone And while we’re at it: Of course the Android system has got some flaws, but I think the situation’s similar to desktop environments: The on-board software is able to provide some basic things, but it’s up to third party developers to provide apps with full functionality, especially when I think of features regarding contacts (e.g. edit groups and birthdays, share via Bluetooth or SMS), calendar (e.g. search) or e-mail (e.g. search). Further apps I have installed are on this always almost complete and up-to-date list—HTH: Continue reading "Why I rooted my phone" Thursday, September 9. 2010Wo das Netz nicht gar so dünn ist, II![]() Ich habe nun wieder meinen von früher lieb gewonnenen Downstream von 16 Mbit/s und Upstream von 1 Mbit/s – und das außerhalb des Ballungsraums. Eher durch Zufall bin ich draufgekommen, dass es sowas wie VDSL gibt, noch dazu in Österreich, und noch dazu ausschließlich von der Telekom, für die ich mich letztlich entschieden hatte. Fast zwei Jahre lang fuhr ich ja auf 6 Mbit/512 kbit, was eigentlich für mich ganz OK war, abgesehen vom schneckenden Upstream bei Foto-Uploads oder Mail-Attachments. Nun habe ich mit deren GigaSpeed 16 also wieder meine „1-fache“ Geschwindigkeit, ohne auf Alternativtechnologien wie TV-Kabel oder Funk ausgewichen zu sein. Bei SpeedTest.net konnte ich 10–11 Mbit (max. 12,5 Mbit) Downstream messen, während der Upstream recht gut mit bis zu 0,96 Mbit ausgereizt wird; beides also praktisch eine Verdoppelung. Es wäre sogar das GigaSpeed 30 mit 30 Mbit/3 Mbit möglich gewesen, wäre aber zu viel des Guten für meine Verhältnisse. Warten wir erstmal ein paar Jahre ab, bis des Sohnes Ansprüche größer werden. Monday, June 14. 2010VOR-/ÖBB-Fahrpläne mit Android abrufen, II![]() Zu meinem Initialposting zu diesem Thema gibt es nun ein Update: Die SCOTTY mobil-Version für (Non-Android) Motorola-Handys, scottymobil_mot.zip, lässt sich nun via NetMite.com konvertieren und auf Android-Smartphones via J2ME Runner (aus dem Market) betreiben. Ob auch die anderen Versionen laufen, war ich zu faul auszuprobieren; vermutlich funktioniert es nun einfach dank eines aktualisieren J2ME Runners. Die Applikation scheint jedenfalls vollständig zu funktionieren. Leider wird damit den ÖBB der Druck genommen, doch noch eine offizielle Version für Android zur Verfügung zu stellen. Sunday, May 2. 2010Averaging an image sequence with ImageMagick![]() Besides the fact that it was a pain to find out how ImageMagick’s -average option is to be used, it turned out to operate wrongly. The switch calculates the mean of an image sequence, i.e. the mean color values for every pixel. Say, if you have a bunch of images with file names like img*.jpg and want the average saved into avg.jpg, the command line is: $ convert img*jpg -average avg.jpg Pretty intuitive. The problem is that you define the mean image Ī[n] of n images I[k] as while ImageMagick does it recursively as
giving you wrong weights 1⁄2n−k+1 like e.g. for n=8 instead of the intended weights 1⁄n like
This misbehaviour can be proven e.g. by taking this sequence of a plain blue, green and red image: and averaging it with the above command. The result is too reddish:
The solution I found was to call convert recursively like this: #!/bin/bash i=0 for file in img*jpg; do echo -n "$file.. " if [ $i -eq 0 ]; then cp $file avg.jpg else convert $file avg.jpg -fx "(u+$i*v)/$[$i+1]" avg.jpg fi i=$[$i+1] done By this, the average of the above example images correctly becomes gray: There might be similar problems with the other image sequence operators, but I haven’t examined them. Maybe I should file a bug. Friday, April 16. 2010VOR-/ÖBB-Fahrpläne mit Android abrufen![]() Ich bin unlängst von einem Symbian-Handy auf ein Android umgestiegen und wollte die Applikation SCOTTY mobil von den ÖBB dort weiterbenutzen, um bequem aktuelle Zugverbindungen bzw. -verspätungen abrufen zu können, jedoch: Es gibt diese App nicht für Android, und auch nicht auf absehbare Zeit. Daher liste ich hier einmal die Möglichkeiten auf, die bleiben. Eins vorweg: Sie sind allesamt höchst unbefriedigend.
Thursday, February 25. 2010Work around the image scaling "bug"![]() ![]() Eric Brasseur explained a “bug” in the scaling algorithm of current image processing software. It’s not really a bug, technically, or mathematically. Calculating the numerical average of the surroundings of a pixel as the new color value is a pretty correct approach to scale an image down—if it’s seen as a data matrix. Rather, it’s visually not the thing you’d expect. Technically speaking, the problem is that “the computations are performed as if the scale of brightnesses was linear while in fact it is an exponential scale.” In mathematical terms: “a gamma of 1.0 is assumed while it is 2.2.” Here’s an example of what might occur: The wrong way:
Obviously, this might not be what you intended. The right way: Continue reading "Work around the image scaling "bug""
Posted by Stephan Paukner
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Droid and iPhone dislike cheap USB chargers unless...![]() ... you have an electronic hacker in your neighborhood. I bought the cheap Chinese solar USB charger revolt “4 Seasons” and wanted to use it to charge my Motorola Milestone/Droid or other devices while travelling by train or bike or during a hike. Unfortunately, it only provided power to “dumb” devices like not-so-smart phones or USB On-The-Go hard disks. When I connected it to my Milestone, the phone didn’t jump to the charging state. WTF? It turned out that modern smartphones like Milestone/Droid or iPhone rely on a properly implemented USB standard, what means that it’s not enough that the two outermost USB pins carry the needed voltage, but the inner pins must also provide a minimal “data voltage”. The problem is described here, and here is a DIY solution. Thanks go to my work mate Wolfi for hacking the solar charger successfully.
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