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  • Software to clean up photos of whiteboards and documents?

    - by Norman Ramsey
    I take a lot of photos of whiteboards, blackboards, and so on for teaching purposes (examples online through May 2010). I'm interested in cleaning them up for archival purposes, preferably using Linux. Commercial products ClearBoard and PhotoNote are priced a little aggressively for my purposes, plus my students would like to have this capability too. Does anyone know of any good, open source software for Converting photographs to images with just a few colors? Eliminating perspective distortion? Removing unwanted junk from around the edges of an image? or anything like that? I'm imagining that I start out with a picture of my whiteboard using red and black markers, and I end up with a three-color image using just white, red, and black. Or I photograph a laser-printed document and end up with a clean black-and-white image. I have tried standard tools that reduce the number of colors in an image, and they do a terrible job—probably because they are trying to reproduce the uneven illumination of the original image. Command-line Linux tools would be ideal.

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  • Combine Multiple Audio Files into a single higher-quality audio File

    - by namenlos
    BACKGROUND My team gave a demo to a large audience - we recorded the audio of the demo in multiple locations in the room (3) the audio was recorded using cheap laptop microphones I was not involved in the recording of the audio or the demo Both audio files suck in some form the first one is of a recording near the speaker - which clearly gets his voice but the the audience is audience is muffled - also this one is slightly noisy The second recording was done in the middle of the audience - it gets the audience questions clearly but actually gets the speaker rather sometimes well and sometimes poorly (not all the speakers spoke loudly enough to be heard) MY QUESTION Is there any techinque or software which can be used to merge these audio files in such a way that the best qualities of each are preserved. I am NOT asking now to simply merge them together in one track - I've already done that in Audacity and it is certainly better - what I am looking for could be considered closer to how HDR images are created - multiple exposures combined into an enhanced new version which is not simply an average of the inputs. NOTE Am not an "Audio" guy - just a normal user

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  • Get image pixels of prescribed color

    - by ohadsc
    Hi, I have an image (PNG or JPG) inside which there is at least one pixel of a certain RGB color I know in advance I want to find the pixel(s) of that color For example, I may have image.jpg inside which I know some pixel has the RGB value 255,100,200. I want a program that will give me the list of pixels (if any) of that color in the image Anyone know of a tool to help me with that ? Thanks !

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  • What's the state of the art in image upscaling?

    - by monov
    I like to collect cool pics and use them as wallpapers or for other things. Often, artists publish only low-res versions, probably for fear of theft. Example: Gabriel Pulecio's BIRDS Now, if I want to use that as a wallpaper, I'd have to upscale it, and obviously that'd make it look blurry because of the bicubic interpolation. I realize there's no real way to get a high-res version from a low-res pic, because the information is not simply there. That said, I'm wondering if heuristics have been developed for upscaling with less apparent loss of quality. Those would probably be optimized for specific image types. For photorealistic pictures, for cartoons with large flat areas, for pixel art... One algorithm I'm aware of is Seam Carving. It works for some kinds of pics, especially ones with a plain, undetailed or uninteresting background, and a subject that strongly stands out. But it's far from being general-purpose. Applying it to the above pic produces this. It looks quite sharp, but the proportions are horribly distorted because the algorithm is not designed for this kind of pic. Another is Pixel art scaling algorithms. Those are completely unfit for anything other than actual pixel art that's pixelized to begin with. For example, I tried the scale2x windows binary on my pic, but its output was nearly indistinguishable from nearest-neighbour scaling because the algorithm didn't detect any isolated pixely fragments to work from. Something else I tried was: I enlarged the image in Photoshop with bicubic interpolation, then I applied unsharp mask. The result looks pretty bad. The red blotch is actually resized reasonably well, but the dove is far from it. What I'm looking for is some app that makes a best-effort attempt at upscaling any input image while minimizing blurriness. If you know of any, I'll be thankful. Note that the subjective prettiness and sharpness of the result is what matters... the result doesn't need to be completely faithful to the original small image.

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  • Photoshop: HSL Color picker plugin?

    - by Ian Boyd
    Is there a plugin that can let Photoshop use a HSL color picker, rather than HSV (which Adobe calls HSB)? In other words, any/all of the following locations could have an HSL option: Or perhaps a plugin with it's own color picker. Reference RGB HSL HSV (aka HSB) ============= =============== ================ (1, 0, 0 ) ( 0°, 1, 0.5 ) ( 0°, 1, 1 ) (0.5, 1, 0.5) (120°, 1, 0.75) (120°, 0.5, 1 ) (0, 0, 0.5) (240°, 1, 0.25) (240°, 1, 0.5)

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  • Paint.NET equivalent for Linux?

    - by Macha
    On Windows, my favorite image editor is Paint.NET. However, on Linux, GIMP is as unfriendly as photoshop despite having less features. (i.e. It takes ages to load, their's far too much stuff). Most of my image editing is simple things where Photoshop or GIMP would be overkill. Paint.NET does not run on Wine or Mono. So is there any similar fast and simple but powerful image editor available for Linux? EDIT: There is a Mono version available, but I don't want to have to deal with installing svn versions of mono, and compiling the version myself.

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  • good way of changing all pixels of one particular color to another particular color in a jpeg/png?

    - by gojira666
    I have an image which looks like this: http://img21.imageshack.us/i/64054053.jpg/ However the yellow line needs to be red and the cyan line needs to be green. I have MS Paint and IrfanView. How can I change the colors of the yellow and cyan line without individually selecting all pixels manually? I.e. what is a good way of changing all pixels of one color to another color?

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  • How does Deep Zoom (Microsoft Seadragon) work?

    - by Norman Ramsey
    I saw an incredible on Photosynth and Seadragon, some "deep zoom" technology recently acquired by Microsoft. There's also a less responsive version on the web. I'd really like to know how the technology works. Blog entries and web pages welcome, but the ideal answer will include one or more references to published papers in the professional literature.

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  • Image Classification - Detecting an image is cartoon-like

    - by kingb
    I have a large amount of jpeg thumbnail images ranging in size from 120x90 to 320x240 and I would like to classify them as either Real Life-like or Cartoon-like. Are there any applications that will have cartoon classification capabilities? This application should work on Linux, and should take an image path on the command-line and return either 0 or 1 (echo $?).

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  • How to convert poor quality bitmap image to vector?

    - by Macha
    I'm designing a website for a group which has lost the original digital image for their logo. The only file they have of it is a jpg which was embedded into a word document. The image has everything possible wrong with it: Anti-aliased onto a white background where it should be transparent Image artefacts Resized downwards poorly. Lines that should be straight and solid aren't. I've currently used the wand tool to get rid of the white background, and stuck it on the website, but it's poor quality makes it stick out like a sore thumb. I need a few different sizes of it to use, so how would I go about creating a vector image based on it?

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  • How to get a good clean newspaper scan?

    - by itsadok
    I tried a few times to scan newspaper articles, but the images I got were always blotchy and with bad colors (sort of like this). Sometimes I see some really good scans, like this. What is the trick to get such good results? Do I need some high-quality scanner, or do I need some good photoshop filters? If there was something I could do using free tools it would be awesome.

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  • MS Paint for Gnome

    - by flybywire
    I want an MS Paint like program for GNOME. GIMP is too much for me. I find it very frustrating for the simple tasks I do (adding text, arrows and circles to screenshots to highlight different features of a program).

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  • How to resize images without loss in quality ?

    - by qWolf
    Hi everybody. I have a image JPEG with resolution is 2010 x 1080 (Pixels). And now, I want resize this image to 338 x 450 without losing image quality, how can I do ? (for ex: After I zoom in image, its quality was not good! ) Which software I can use ? Let me know about a solution. Thanks for all responses ;) Update / Clarification: My purpose is have a page contains image. This image have size is 2010x1080 (in original). First, image display on web page with size is 338x450. Then, to see image more clear, I want to zoom in. But when I do this, image quality was lost. Now, i don't know how to execute this problem :(

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  • Scanned JPEGs are large and slow to load - can they be optimized losslessly?

    - by Alistair Knock
    I have hundreds of JPEG photographs which were scanned about 5 years ago from negative using a Konica Minolta DiMAGE Scan Dual IV. The dimensions are ~4500x3000, and the filesize is around 12Mb, compared to shots from a DSLR with dimensions of 3000x2300 and filesize of 2-4Mb (actually, these are the output from a RAW convertor). The filesize is obviously quite a big difference, but the issue that's bothering me is that the (perceived) loading time is at least 10 times slower. Is this size/speed discrepancy likely to be because the scanner software saved the JPEGs inefficiently / using an old compression format, or is it simply that the scanned negatives contain much more "detail" (in the form of grain/noise) than the digital images? If the former, is there a way to losslessly optimize them? I've tried re-exporting the scanned files to full size JPEG from my RAW software but the filesize is pretty much the same. Both files will have been saved at 100 quality.

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  • How can I boost the volume of my Video

    - by Sunny Shah.
    I have a video that I need to pass on to some of my friends but it has very low audio volume. How can I boost the audio volume in this video so that it has a similar level as my other videos? Is there a video converter that can boost the audio volume?

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  • Can anyone recommend a decent tool for optimizing images other than Photoshop

    - by toomanyairmiles
    Can anyone recommend a decent tool for optimising images other than adobe photoshop, the gimp etc? I'm looking to optimise images for the web preferably online and free. Basically I have a client who can't install additional software on their work PC but needs to optimise photographs and other images for their website and is presently uploading 1 or 2 Mb files. On a personal level I'm interested to see what other people are using...

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  • netcat as a multithread server

    - by etuardu
    Hello, I use netcat to run a simple server like this: while true; do nc -l -p 2468 -e ./my_exe; done This way, anyone is able to connect to my host on port 2468 and talk with "my_exe". Unfortunately, if someone else wants to connect during an open session, it would get a "Connection refused" error, because netcat is no longer in listening until the next "while" loop. Is there a way to make netcat behave like a multithread server, i.e. always in listening for incoming connections? If not, are there some workarounds for this? Thank you all!

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