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58 items tagged "color"
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12:01
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Hack a Day
Adding some lights to your everyday items will certainly give you a style leaning toward the world of Blade Runner. But if you can add functionality to control the blinky components you’ve actually got something. A great example of this is [Kathryn McElroy's] Chameleon Bag. It’s a shoulder bag with a light-up flap. It can [...]
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10:00
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Hack a Day
With the help of a microcontroller, a few strings of GE Color Effect Christmas lights can be easily turned into a fully programmable LED strip, or if you are so inclined, a huge RGB LED display. [Hubbe] had a few strings of these Color Effect Christmas lights, but didn’t want to spend the time arranging [...]
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5:01
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Hack a Day
For their final project in a microcontrollers course, [Trudy] and [Josh] designed a pair of morse code transceivers. To send the message, they used an array of IR LEDs. The message is received using a Gameboy Color Camera, which takes care of basic image processing. This allows a 8-bit ATMega1284p microcontroller to handle transmitting and [...]
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10:11
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Hack a Day
I’ve seen the concept art for “real world eyedroppers” several times. I haven’t noticed any of the products come to market though. It isn’t the technology stoping them, color sampling can be done a million ways. I picked one of the easiest ways and tossed something together pretty quickly. The method I chose is outlined [...]
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12:00
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Hack a Day
When [Anton] picked up an old translucent purple Game Boy Color, he noticed a nearly complete lack of sound coming from the speaker. This simply would not do, so [Anton] replaced the speaker and soldered in a 2 Watt amp, making his Game Boy very loud indeed. After cracking open his Game Boy, [Anton] noticed [...]
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21:39
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SecDocs
Authors:
Seth Schoen Tags:
barcode Event:
Chaos Communication Camp 2007 Abstract: Almost all color laser printers help track their users by printing hard-to-see patterns of yellow dots all over every page. The Electronic Frontier Foundation has been trying to get to the bottom of these dot patterns. What are these dots saying, where do they come from, who can read them, and is there any hope of getting rid of them? For decades, color laser printers have invisibly tracked their users by including patterns of tiny yellow dots on every single output page. This tracking was known to people who worked in the imaging industry and was intermittently disclosed by some manufacturers in their documentation. But even today, most end-users remain unaware of it. For the past two years, the Electronic Frontier Foundation (EFF) has examined this tracking mechanism - a system of exemplary interest because of the non-transparent way in which governments appear to have persuaded technology firms to change their product design without any specific legal basis - and, with the help of many volunteers, we've learned how to read some of the hidden information. This research is ongoing, but we already know how to make the dots easily visible (with LED lights, microscopes, or ordinary color scanners), and we know how to read the data embedded by several major printer manufacturers. Typically, a printer will mark its output pages with the printer serial number and the date and time that the page was printed (if the printer has its own built-in clock). This information facilitates associating color print output with individuals, because it could be correlated with credit card records, server logs, surveillance camera footage, and the like. We've succeeded in attracting a large amount of media interest, including television, newspaper, and magazine coverage in the United States and around the world. (Note that we did not discover the existence of these dots; we are simply the first organization to start to make a reasonably detailed and public study of them.) This coverage is valuable, but it has not necessarily changed industry practices. To do that, we need to go further. We're continuing to try to break printer codes, to explore the world of document forensics and expose why many recordable media are far less anonymous than their users expect, and to try to compel the U.S. government to reveal its role in inducing printer companies to create this technology. In this talk, I'll present a hands-on demonstration of how to find and interpret the tracking codes in some typical color laser printer output, survey some of the historical and political issues, and invite audience members to join us in shedding more (blue?) light on the subject. We're also interested in countermeasures that would disable the tracking or make it ineffective, and I'll present the best known countermeasures together with their possible limitations. Perhaps CCC attendees can help us find better countermeasures.
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8:01
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Hack a Day
As a relic of the early 80s, the TRS-80 Color Computer couldn’t display very many colors. By default, the CoCo could only display 8 colors on the screen at a time, but [John] figured out a way to increase the number of colors displayed using a very simple trick that surprisingly isn’t found in original CoCo [...]
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13:01
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Hack a Day
If you’ve ever had to organize a bunch of resistors, you’ll know why [Anthony] created EESpeak. It’s a voice-controlled component look up tool that calculates a component value by listening to you read out color code bands. In his demo video of EESpeak, [Anthony] reads off the color bands of several resistors whilst the program dutifully [...]
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9:01
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Hack a Day
[Terry Miller] picked up a moon light on the cheap. All it does is light up some white LEDs to simulate moon phases after sensing nightfall via an LDR. He figured he could do better and set out to replace the electronics with a more colorful offering. He chose to use an ATmega328 because he [...]
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9:01
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Hack a Day
[Terry Miller] picked up a moon light on the cheap. All it does is light up some white LEDs to simulate moon phases after sensing nightfall via an LDR. He figured he could do better and set out to replace the electronics with a more colorful offering. He chose to use an ATmega328 because he [...]
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14:06
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Hack a Day
If you’re staging some epic Star Wars battles you could go original with Red or Blue lightsabers. But what if you decide you’re more of a fan of Jedi and want to go green? Or perhaps the prequels have inspired you to take on purple? Why choose at build time when you can adjust the color [...]
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14:00
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Hack a Day
If you want to go high bandwidth, fiber optics is the way to go. From trans-oceanic cables to the yet-unseen ‘fiber to every home,’ fiber optics allows a lot more bandwidth than a copper cable. In low-bandwidth applications, fiber optic cable transmits data using one color of light. There’s a way to get more bandwidth [...]
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12:01
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Hack a Day
You may remember Perler beads from first or second grade; these small plastic beads are placed into a peg board and then ironed to produce a solid multicolored piece of plastic. Recently, Perler beads have seen somewhat of a revival due to a few people creating 8 and 16-bit video game sprites in plastic, but [...]
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6:01
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Hack a Day
[Dearmash] put together this RGB LED display using triangles for each pixel. It’s an interesting deviation from the traditional grid layout. There are two video demos after the break. The first is a plasma-style pattern generated in Processing. The second is a spinning color wheel which would be perfect if synchronized with your Photoshop color [...]
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17:01
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Hack a Day
What do those colorful iPod Nano cases have in common with sapphires? In both substances the color is not on the surface, but integrated in the structure of the material. As usually, [Bill Hammack] unveils the interesting concepts behind coloring metal through anodization in his latest Engineer Guy episode. We’re not strangers to the anodization process. [...]
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10:01
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Hack a Day
We should have included a footnote in the title. You can say that [Thomas Polasek] installed a full version of Arch Linux on his Nook Color, but there’s one caveat. It’s running on top of the Android kernel and his proof-of-concept uses a second computer to get it up and running. But there’s potential for [...]
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15:19
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Hack a Day
[Robert] put together his own illuminated coasters that know when they hold a drink. They look fantastic, thanks to professionally produced PCBs and a layered, laser-cut acrylic case. They’re much like the pagers given to restaurant-goes who are waiting for tables, but this version is much fancier (and doesn’t include the vibrating/paging feature). The RGB-LED [...]
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12:01
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Hack a Day
[BadWolf's] girlfriend wanted him to build her a lamp for Christmas and he didn’t disappoint. What he came up with is a water-filled color changing lamp with bubbles for added interest. See for yourself in the clip after the jump. The color changing properties are easily taken care of by some waterproof RGB LED strips. [...]
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7:01
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Hack a Day
[Rick Osgood] wanted to build a color sensor that could be held up to any object to get RGB color values. He originally started with a photoresistor and a few LEDs, but couldn’t get that to work reliably. [Rick] finally completed his color sensor after finding a digital luminosity sensor on Adafruit, ending up with a [...]
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6:01
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Hack a Day
You’re not still playing nDoom in black and white, are you? What decade do live in? Thankfully, the Doom port for TI-nspire calculators has been upgraded to support color. That is if you’ve got the hardware to run it. The video after the break (and the image above) shows a TI-nspire CX running the popular [...]
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8:05
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Hack a Day
Back in 2001, [Helmar] made an awesome monochrome video display out of a red laser pointer and a spinning 18-sided mirror. Blue and green lasers are much less expensive than they were a decade ago, so [Helmar] decided to go full color with his laser projector. (In German, so fire up Chrome or get the Google [...]
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9:01
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Hack a Day
[Jim] wrote in to share some work he did with GE Color Effects LED lights in an effort to create a light display for his boat. He saw our coverage of the Color Effects G-35 hacking efforts by DeepDarc last year, and knew that they would be prefect for the boat. He did some careful [...]
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15:01
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Hack a Day
[Fjord Carver] brings together an RGB LED and CdS Photoresistor to make a color sensor. Those Cadmium Sulfide lights sensors usually have a very wide swing of resistance when exposed to varying levels of light sensitivity. That makes for great resolution when reading them using the ADC of a microcontroller. The LED comes into play by shining [...]
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5:01
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Hack a Day
XDA forum member [craigbru] wanted to beef up the audio setup in his Jeep, and thought that his Nook Color would make a suitable replacement. Since he jailbroke the e-reader, the head unit upgrade lets him do just about anything you can imagine, all from the comfort of the driver’s seat. Seeing that he would [...]
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7:08
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Hack a Day
[Richard] wanted to create a color profile for his computer monitor, but he wasn’t thrilled with the existing color calibration offerings he found for sale. Color calibration tools can be somewhat costly, but even more troubling to [Richard] was the fact that they are all closed source. Closed hardware and closed software can be a [...]
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11:01
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Hack a Day
[Paul] was looking to spice up his holiday decorations this year, so he picked up some GE Color Effects lights and started hacking away. We’ve already seen how hacker-friendly these LED bulbs are, which is why [Paul] decided to give them a try. His ultimate goal was to synchronize several sets of lights from one [...]
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6:05
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Hack a Day
The Halloween parties this weekend are over, but that doesn’t mean there’s not time for a few more to finish a build before children start knocking on doors tonight. [formori] at Lakehead University wanted to do something spectacular for a pumpkin carving contest, so he and a few other EE students came up with a [...]
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11:01
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Hack a Day
ElecFreaks is selling a new color sensing module based on the TSC230 sensor. They’ve posted a demonstration using an Arduino that shows off what this sensor is capable of. The module includes four white LEDs which give a baseline of light to help normalize readings when reflected off of differently colored surfaces. The white balance [...]
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11:59
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Hack a Day
This color changing door handle was made using a very simple manufacturing process. [Barmak] already had experience working with polyester resins when making passive component filled drawer pulls (he included a couple of pictures at the end of his post). The same process was used here except that instead making it from one solid chunk [...]
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10:22
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Hack a Day
[Charles] wanted to put some LEDs in his guitar. He also wanted individual notes to output certain colors, but he couldn’t find any projects with tone-based algorithms to convert sound into colors. After about a year of work, his ColorChord guitar was born. Unlike every other color organ build we’ve seen, the color of a note [...]
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12:01
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Hack a Day
All EL wire drivers use a resonator circuit to supply power to the EL wire. It’s an efficient system, but [Paul] noticed that there was some color change when powering different lengths of wire off of the same driver. He realized that this is because of the changing frequency of the resonator circuit, so the [...]
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11:38
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Hack a Day
[Craig] sent in a link to this project which manages to implement color tracking on an 8-bit microcontroller at 60 frames per second. That’s some pretty incredible performance, but we’re also not talking about using a hobby-grade microcontroller. The C8051F360 is an ARM microcontroller with 100 MIPS throughput and with a system clock that can [...]
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16:00
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Hack a Day
[Alex] has reduced the resolution of his timepiece as a trade-off for speedy-readability. At least that’s what he claims when describing his color-changing clock. It uses a ShiftBrite to slowly alter the hue of the clock based on the current time. The concept is interesting: 12:00 starts off at white and slowly fades to green [...]
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12:01
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Hack a Day
[John W. Linville] wrote a digital video player for the Tandy Color Computer (aka TRS-80). The decades-old hardware performs quite well considering the limited resource he had to work with. This is the second iteration of his player, and can be seen after the break playing a promo video for CoCoFEST 2011 where he’ll show [...]
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7:49
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Hack a Day
Instructables user [Andrew] was given a free, but damaged GameBoy color by a friend. The friend’s dog had done quite a number on the outside of the handheld, but it was definitely usable. After replacing some of the outer shell, [Andrew] decided that he would try tweaking the GameBoy to utilize a solar cell in [...]
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11:10
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Hack a Day
[Simon] improved upon an existing hack by making this Arduino ambient lighting system that has four different color regions. He was inspired by [Roy's] processing-based setup which we saw a few weeks ago. That system used processing to determine the average color of the currently displayed image, then it displayed the color on a single RGB [...]
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12:16
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Hack a Day
[Deeper-blue] has released all the files necessary to get Android honeycomb working on your nook color. We had a chance to play with the nook color for a bit, but ours was only on Android version 2.1. It seems like they’ve come a long way with the capabilities of this simple e-reader since then. While [...]
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11:19
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SecuriTeam
A potential security vulnerability has been identified with certain HP LaserJet printers, HP Color LaserJet printers and HP Digital Senders.
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Make your website safer. Use external penetration testing service. First report ready in one hour!
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7:30
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Hack a Day
[George Hadley] developed a nice setup to control the color of a replica Lightsaber. A small PCB houses a PIC 18F2221 and three switching transistors for the colors. A powerful LED resides in the tip of the handle, lighting up the diffuser that makes up the blade. But our favorite part is the control scheme. [...]
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21:01
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Packet Storm Security Recent Files
Zero Day Initiative Advisory 10-203 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Oracle's Java Runtime Environment. User interaction is required to exploit this vulnerability in that the target must visit a malicious page. The specific flaw exists within the implementation of the color profile parser. When processing a particular Tag structure out of a color profile, the parser will read a 32-bit integer and use it to calculate the size for a memory allocation. Due to the result being larger than 32 bits, an integer overflow will occur. This will lead to code execution under the context of the application.
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21:01
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Packet Storm Security Recent Files
Zero Day Initiative Advisory 10-204 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Oracle's Java Runtime Environment. User interaction is required to exploit this vulnerability in that the target must visit a malicious page. The specific flaw exists within the implementation of the color profile parser. When processing a the 'devs' tag structure out of a color profile, the parser will read a 32-bit integer and use it to calculate the size for a memory allocation. Due to the result being larger than 32 bits, an integer overflow will occur. This will lead to code execution under the context of the application.
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21:01
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Packet Storm Security Advisories
Zero Day Initiative Advisory 10-203 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Oracle's Java Runtime Environment. User interaction is required to exploit this vulnerability in that the target must visit a malicious page. The specific flaw exists within the implementation of the color profile parser. When processing a particular Tag structure out of a color profile, the parser will read a 32-bit integer and use it to calculate the size for a memory allocation. Due to the result being larger than 32 bits, an integer overflow will occur. This will lead to code execution under the context of the application.
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21:00
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Packet Storm Security Advisories
Zero Day Initiative Advisory 10-204 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Oracle's Java Runtime Environment. User interaction is required to exploit this vulnerability in that the target must visit a malicious page. The specific flaw exists within the implementation of the color profile parser. When processing a the 'devs' tag structure out of a color profile, the parser will read a 32-bit integer and use it to calculate the size for a memory allocation. Due to the result being larger than 32 bits, an integer overflow will occur. This will lead to code execution under the context of the application.
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6:00
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Hack a Day
[Bogdan] set out to build the all-too-familiar binary clock. But, he didn’t want to be ordinary, and set the goal of making the clock as hard to read as possible. What he ended up with is a clock that is almost impossible to read correctly. He’s using colors to tell the time. We immediately thought [...]
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11:04
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Hack a Day
[PT] tipped us off about a new way to screen bots from automatically leaving comments. Resisty is like CAPTCHA but it requires you to decipher color bands on a resistor instead of mangled text. This won’t do much for the cause of digitizing books, but if you can never remember your color codes this is [...]
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13:21
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Hack a Day
Tired of every printed circuit board you etch coming out brown? Take a page out of [Dane's] book and dye your PCB to just about any color you want. One hour submerged in a 200 degree bath of Rit dye turned his brown FR4 substrate to the desired dark green. We give him points for [...]
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12:14
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Hack a Day
We feel like trumpets should be sounding. Someone took the overused project of connecting RGB LEDs to a microcontroller and produced something useful. [Paul] created Dr. Boardman’s Color Conundrum which works much like a simple mechanical coin-op game you might find at a carnival. When switched on, a random color is displayed by the ping-pong [...]
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