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  • How to read and modify the colorspace of an image in c#

    - by Matthias
    I'm loading a Bitmap from a jpg file. If the image is not 24bit RGB, I'd like to convert it. The conversion should be fairly fast. The images I'm loading are up to huge (9000*9000 pixel with a compressed size of 40-50MB). How can this be done? Btw: I don't want to use any external libraries if possible. But if you know of an open source utility class performing the most common imaging tasks, I'd be happy to hear about it. Thanks in advance.

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  • How to isolate a single color in an image

    - by Janusz
    I'm using the python OpenCV bindings and at the moment I try to isolate a colorrange. That means I want to filter out everything that is not reddish. I tried to take only the red color channel but this includes the white spaces in the Image too. What is a good way to do that?

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  • Adobe Color Profiles/Color Spaces, how is it possible that this works?

    - by leeand00
    I'm learning about Color Profiles/Color Spaces/Monitor Color Management Profiles and I was just wondering how any of that justified considering the fact that I could throw the entire color anything off by adjusting the brightness and contrast of my monitor? Additionally there are things like lighting in the place where your monitor resides. I don't understand what makes it possible to know that the colors that you are looking at on your monitor are accurate. I really don't have any idea where to start (considering I obviously can't even get the terminology right in the first place...:-p)

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  • Simulate Photoshop's saturation changes in Imagemagick

    - by Ambirex
    In Photoshop you can adjust the hue, saturation and lightness of an image with three sliders. ImageMagick you can modulate the brightness, saturation, and hue. Minimizing the saturation correctly produces a black and white image in both programs. Maxing out the saturation appears close, but ImageMagick appears to soften some of the blown out edges while Photoshop will expose more the the compression artifacts. How can I accurately reproduce Photoshop's saturation changes from within ImageMagick, or other command line tool.

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  • Location detecting tecniques for IP addresses

    - by ilhan
    What are the location detecting tecniques for IP adresses? I know to look at the $_SERVER['HTTP_ACCEPT_LANGUAGE'] (not accurate but mostly useful to detect location, for example if an IP range's users set French to their browser then it means that this range) belongs to France and gethostbyaddr($_SERVER['REMOTE_ADDR']) (to look country code top-level domain) then may be to whois gethostbyaddr($_SERVER['REMOTE_ADDR']) sometimes: $HTTP_USER_AGENT (Firefox's user agent string has language code, not accurate but mostly can be used to detect the location) But what about cities?

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  • How do I convert RGB into HSV in Cocoa Touch?

    - by Evelyn
    I want to set the background color of a label using HSV instead of RGB. How do I implement this into code? Code: //.m file #import "IBAppDelegate.h" @implementation IBAppDelegate @synthesize label; { self.label.backgroundColor = [UIColor colorWithRed:1.0f green:0.8f blue:0.0f alpha:1.0f]; }

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  • XCode: How to adress dynamic Variables?

    - by Markus S.
    I want to do something like that: for (v=1;v=150;v++) { for (h=1; h=250;v++) { tile_0%i_0%i.image = [UIImage imageWithData:tmp_content_of_tile]; //1st %i = v; 2nd %i = h } } In the %i should be inserted the current value of "v" or "h"? Is it possible? How is it called? Greets!

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  • Connecting private IPs

    - by Greg Roberts
    A friend of mine told me there was a way to connect two private IPs without using a proxy server. The idea was that both computers connected to a public server and some how the server joined the private connections and won't use any more bandwidth. Is this true? How's this technique named? Thanks

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  • Programatically find common European street names

    - by Adam Matan
    Hi, I am in the middle of designing a web form for German and French users. Within this form, the users would have to type street names several times. I want to minimize the annoyance to the user, and offer autocomplete feature based on common French and German street names. Any idea where I can a royalty-free list? Thanks a bunch, Adam

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  • Python - create blacklist file of IP addresses that have more than 5 failed login attempts in the au

    - by oz_babe
    Basically I have an authlog/syslog file with a list of log in attempts and IP addresses - I need to make a Python program that will create a txt file with all the IP addresses that have more than 5 failed login attempts - a sort of "blacklist". So basically something like: if "uniqueipaddress" and "authentication failure" appear more than 5 times, add uniqueipaddress to txt file. Any help would be greatly appreciated - please try and make it simple as I am very, very inexperienced in programming in Python! Thanks.

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  • CMYK + CMYK = ? CMYK / 2 = ?

    - by Pete
    Suppose there are two colors defined in CMYK: color1 = 30, 40, 50, 60 color2 = 50, 60, 70, 80 If they were to be printed what values would the resulting color have? color_new = min(cyan1 + cyan2, 100), min(magenta1 + magenta2, 100), min(yellow1 + yellow2, 100), min(black1 + black2, 100)? Suppose there is a color defined in CMYK: color = 40, 30, 30, 100 It is possible to print a color at partial intensity, i.e. as a tint. What values would have a 50% tint of that color? color_new = cyan / 2, magenta / 2, yellow / 2, black / 2? I'm asking this to better understand the "tintTransform" function in PDF Reference 1.7, 4.5.5 Special Color Spaces, DeviceN Color Spaces Update: To better clarify: I'm not entirely concerned with human perception or how the CMYK dyies react to the paper. If someone specifies 90% tint which, when printed, looks like full intensity colorant, that's ok. In other words, if I asking how to compute 50% of cmyk(40, 30, 30, 100) I'm asking how to compute the new values, regardless of whether the result looks half-dark or not. Update 2: I'm confused now. I checked this in InDesign and Acrobat. For example Pantone 3005 has CMYK 100, 34, 0, 2, and its 25% tint has CMYK 25, 8.5, 0, 0.5. Does it mean I can "monkey around in a linear way"?

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  • Java anonymous class efficiency implications

    - by Po
    Is there any difference in efficiency (e.g. execution time, code size, etc.) between these two ways of doing things? Below are contrived examples that create objects and do nothing, but my actual scenarios may be creating new Threads, Listeners, etc. Assume the following pieces of code happen in a loop so that it might make a difference. Using anonymous objects: void doSomething() { for (/* Assume some loop */) { final Object obj1, obj2; // some free variables IWorker anonymousWorker = new IWorker() { doWork() { // do things that refer to obj1 and obj2 } }; } } Defining a class first: void doSomething() { for (/* Assume some loop */) { Object obj1, obj2; IWorker worker = new Worker(obj1, obj2); } } static class Worker implements IWorker { private Object obj1, obj2; public CustomObject(Object obj1, Object obj2) {/* blah blah */} @Override public void doWork() {} }; Thank you :)

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  • How do sites look up addresses from UK postcodes?

    - by ctford
    U.K. that require addresses often ask the user to provide a postcode. The site then offers the user a choice between the addresses that match that postcode. Where do these sites get the data to do this? Are there webservices that match postcodes to addresses? Do sites buy a database of addresses that they then query locally?

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  • Postback not working with ASP.NET Routing (Validation of viewstate MAC failed)

    - by Robert
    Hi. I'm using the ASP.NET 3.5 SP1 System.Web.Routing with classic WebForms, as described in http://chriscavanagh.wordpress.com/2008/04/25/systemwebrouting-with-webforms-sample/ All works fine, I have custom SEO urls and even the postback works. But there is a case where the postback always fails and I get a: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. Here is the scenario to reproduce the error: Create a standard webform mypage.aspx with a button Create a Route that maps "a/b/{id}" to "~/mypage.aspx" When you execute the site, you can navigate http://localhost:XXXX/a/b/something the page works. But when you press the button you get the error. The error doen't happen when the Route is just "a/{id}". It seems to be related to the number of sub-paths in the url. If there are at least 2 sub-paths the viewstate validation fails. You get the error even with EnableViewStateMac="false". Any ideas? Is it a bug? Thanks

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  • How can I use the HSL colorspace in Java?

    - by Eric
    I've had a look at the ColorSpace class, and found the constant TYPE_HLS (which presumably is just HSL in a different order). Can I use this constant to create a Color from hue, saturation, and luminosity? If not, are there any Java classes for this, or do I need to write my own?

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  • DNS Problem in my notebook [closed]

    - by air
    i have windows 2003 server domain environment in my office. my server ip is: 192.168.1.2 if i put this IP in DNS of my laptop network card my folder SYNC works fine & also internet work fine in office. but internet did't work in my home for that i need to change DNS again to Auto & internet start working again. its too difficult to change cause some time i don't have administrative password. is there any solution to that? Thanks

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