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  • How to make ARGB transparency using bitwise operators.

    - by Smejda
    I need to make transparency, having 2 pixels: pixel1: {A, R, G, B} - foreground pixel pixel2: {A, R, G, B} - background pixel A,R,G,B are Byte values each color is represented by byte value now I'm calculating transparency as: newR = pixel2_R * alpha / 255 + pixel1_R * (255 - alpha) / 255 newG = pixel2_G * alpha / 255 + pixel1_G * (255 - alpha) / 255 newB = pixel2_B * alpha / 255 + pixel1_B * (255 - alpha) / 255 but it is too slow I need to do it with bitwise operators (AND,OR,XOR, NEGATION, BIT MOVE)

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  • Implementing ToArgb()

    - by Number8
    Hello -- System.Drawing.Color has a ToArgb() method to return the Int representation of the color. In Silverlight, I think we have to use System.Windows.Media.Color. It has A, R, G, B members, but no method to return a single value. How can I implement ToArgb()? In System.Drawing.Color, ToArgb() consists of return (int) this.Value; System.Windows.Media.Color has a FromArgb(byte A, byte R, byte G, byte B) method. How do I decompose the Int returned by ToArgb() to use with FromArgb()? Thanks for any pointers...

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  • B-V to Kelvin formula

    - by PeanutPower
    Whilst looking for a "B-V color index to temperature conversion formula" I found this javascript: var C1 = 3.979145; var C2 = -0.654499; var C3 = 1.74069; var C4 = -4.608815; var C5 = 6.7926; var C6 = -5.39691; var C7 = 2.19297; var C8 = -.359496; bmv = parseFloat(BV); with (Math) { logt= C1 +C2*bmv +C3*pow(bmv,2) +C4*pow(bmv,3) +C5*pow(bmv,4) +C6*pow(bmv,5) +C7*pow(bmv,6) +C8*pow(bmv,7); t=pow(10,logt); } Which is supposed to convert B-V color index to temperature. Does anyone understand how this is working and if the output value is an approximation for temperature in celcius or kelvin? Is it something to do with products of logarithms?

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  • Hex Code Brightness PHP?

    - by Juddling
    I want users on my website to be able to pick a hex colour, and I just want to display white text for dark colours and black text for light colours. Can you work out the brightness from a hex code (preferably PHP)?

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  • PHP contact form font color is stuck to black

    - by Richard Hayward
    No matter what i try strangely enough my form and thank you page both php files one with embed font coloring and one with an external style sheet refuse to change font color from black. thank you php file: http://www.richiesportfolio.com/contact/thank-you.php contact form php file: http://www.richiesportfolio.com/contact/contactform.php Everything else works purfectly but changing the contact forms font color contactform.php ` <?PHP require_once("./include/fgcontactform.php"); $formproc = new FGContactForm(); if(isset($_POST['submitted'])) { if($formproc->ProcessForm()) { $formproc->RedirectToURL("thank-you.php"); } } ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US" lang="en-US"> <head> <meta http-equiv='Content-Type' content='text/html; charset=utf-8'/> <title>Contact us</title> <link rel="stylesheet" type="text/css" href="http://www.richiesportfolio.com/contact/contact.css" /> <script type='text/javascript' src='scripts/gen_validatorv31.js'></script> </head> <body> <!-- Form Code Start --> <form id='contactus' action='<?php echo $formproc->GetSelfScript(); ?>' method='post' accept-charset='UTF-8'> <fieldset > <legend>Contact Me</legend> <input type='hidden' name='submitted' id='submitted' value='1'/> <input type='hidden' name='<?php echo $formproc->GetFormIDInputName(); ?>' value='<?php echo $formproc->GetFormIDInputValue(); ?>'/> <input type='text' class='spmhidip' name='<?php echo $formproc->GetSpamTrapInputName(); ?>' /> <div class='short_explanation'>* required fields</div> <div><span class='error'><?php echo $formproc->GetErrorMessage(); ?></span></div> <div class='container'> <label for='name' >Your Full Name*: </label><br/> <input type='text' name='name' id='name' value='<?php echo $formproc->SafeDisplay('name') ?>' maxlength="50" /><br/> <span id='contactus_name_errorloc' class='error'></span> </div> <div class='container'> <label for='email' >Email Address*:</label><br/> <input type='text' name='email' id='email' value='<?php echo $formproc->SafeDisplay('email') ?>' maxlength="50" /><br/> <span id='contactus_email_errorloc' class='error'></span> </div> <div class='container'> <label for='message' >Message:</label><br/> <span id='contactus_message_errorloc' class='error'></span> <textarea rows="10" cols="50" name='message' id='message'><?php echo $formproc->SafeDisplay('message') ?></textarea> </div> <div class='container'> <input type='submit' name='Submit' value='Submit' /> </div> </fieldset> </form> <!-- client-side Form Validations: Uses the excellent form validation script from JavaScript-coder.com--> <script type='text/javascript'> // <![CDATA[ var frmvalidator = new Validator("contactus"); frmvalidator.EnableOnPageErrorDisplay(); frmvalidator.EnableMsgsTogether(); frmvalidator.addValidation("name","req","Please provide your name"); frmvalidator.addValidation("email","req","Please provide your email address"); frmvalidator.addValidation("email","email","Please provide a valid email address"); frmvalidator.addValidation("message","maxlen=2048","The message is too long!(more than 2KB!)"); // ]]> </script> </body> </html>` contact.css body,table,tr,td,a,p,h1,h2,h3,h4,h5,input,h3 a,h4 a,h5 ul, li, ul, a { color:#FFF; } #contactus fieldset { width:320px; padding:20px; border:20px; -moz-border-radius: 10px; -webkit-border-radius: 10px; -khtml-border-radius: 10px; border-radius: 10px; } #contactus legend, h2 { font-family : Arial, sans-serif; font-size:1.3em; font-weight:bold; color:#FFF; } #contactus label { font-family : Arial, sans-serif; font-size:0.8em; font-weight: bold; color:#FFF; } #contactus input[type="text"],textarea { font-family : Arial, Verdana, sans-serif; font-size: 0.8em; line-height:140%; color : #000; padding : 3px; border : 1px solid; #999; -moz-border-radius: 5px; -webkit-border-radius: 5px; -khtml-border-radius: 5px; border-radius: 5px; } #contactus input[type="text"] { height:18px; width:220px; -webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px; } #contactus #scaptcha { width:60px; height:18px; } #contactus input[type="submit"] { width:100px; height:30px; padding-left:0px; -webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px; } #contactus textarea { height:120px; width:310px; -webkit-border-radius:8px; -moz-border-radius: 8px; border-radius: 8px; } #contactus input[type="text"]:focus,textarea:focus { color : #009; border : 1px solid #990000; background-color : #ffff99; font-weight:bold; } #contactus .container { margin-top:8px; margin-bottom:10px; color:#FFF; } #contactus .error { font-family: Verdana, Arial, sans-serif; font-size: 0.7em; color: #900; background-color : #111; } #contactus fieldset#antispam { padding:2px; border-top:1px solid #EEE; border-left:0; border-right:0; border-bottom:0; width:350px; } #contactus fieldset#antispam legend { font-family : Arial, sans-serif; font-size: 0.8em; font-weight:bold; color:#FFF; } #contactus .short_explanation { font-family : Arial, sans-serif; font-size: 0.6em; color:#FFF; } /* spam_trap: This input is hidden. This is here to trick the spam bots*/ #contactus .spmhidip { display:none; width:10px; height:3px; } #fg_crdiv { font-family : Arial, sans-serif; font-size: 0.3em; opacity: .2; -moz-opacity: .2; filter: alpha(opacity=20); } #fg_crdiv p { display:none; }

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  • Preview a .NET color

    - by serhio
    The VS debugger gives me: _Color = "{Name=ff000040, ARGB=(255, 0, 0, 64)}" how can I "see" what color is? I tried a html page: <html> <div style="background: rgba(255, 0, 0, 64);">________<div> <h1 style="background-color: ff000040">hello</h1> </html> doesn't work.

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  • How to change font color inside nav element?

    - by user2924752
    I have a element and I want to change the color of the links within it, but all other links on my page are styled using the following CSS: a:link { color:#22b14c; text-decoration:none; } and here is the nav: <nav id="Nav"> <a href="index.html">Home</a> | <a href="Gallery.html">Library</a> | <a href="Contact.html">Contact</a> | <a href="About.html">About</a> </nav> and the nav css: #Nav { margin-top: 20px; background-color: #000000; color: #f2f2f2; font-size: 40px; font-family: "Calibri"; text-align: center; } I tried a span inside the nav element but that didn't work. How can I change the color for these links only inside the element?

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  • Random Color generator in Javascript

    - by n00ki3
    Hi there, i am not an Javascript and i need a little help. Given this function , i want to replace the color with an Random Color generator. document.overlay = GPolyline.fromEncoded({color: "#0000FF", weight: 10, points: encoded_points, zoomFactor: 32, levels: encoded_levels, numLevels: 4 }); Can anyone help me ?

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  • Getting Windows XP colours in .NET

    - by LauraM
    I am trying to get a specific colour used by Windows XP in my .NET application. In Windows XP, if you go the Control Panel in 'category view', on the left hand side you have some 'See Also' options (Windows Update, Help and Support, Other Control Panel Options). The colour I'm trying to get is the light blue background colour shown behind these options. I don't need the hex/RGB value of the colour, as it can change depending on the style settings used on the desktop. My question is - is it possible to programmatically get hold of this colour in a .NET app? The colour doesn't appear to be in SystemColors, although it's very similar to SystemColors.InactiveCaptionText (and I think I can probably get away with using this). I'm just wondering if there is a way to get hold of the exact colour.

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  • Can't set background colour for UIView from ViewController

    - by Curyous
    I have the following code in the view controller: - (void)viewDidLoad { [super viewDidLoad]; ThemeManager *themer = [ThemeManager sharedInstance]; UIView *theView = self.view; UIColor *forBackground = [themer backgroundColour]; [theView setBackgroundColor:forBackground]; } but when execution gets to the setBackgroundColor line, I get the following error: *** -[NSCFNumber CGColor]: unrecognized selector sent to instance 0x1237c40 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFNumber CGColor]: unrecognized selector sent to instance 0x1237c40' There's got to be something simple that I'm doing wrong, how do I set the background colour? Do I have to subclass the view and do it in there? I'd prefer not to have the extra class, even though that is better separation of the whole model/view/controller thing. Update: value returned by [themer backgroundColour] is constructed using colorWithPatternImage:, could this make a difference?

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  • How can I create an automatically generated alteranate table row color ?

    - by UXdesigner
    Good day, I've been trying to make this CSS code work: table.mytable { margin: 0; padding: 0; border: 0; font-size: 0.8em; border-collapse: collapse; } table.mytable td, table.mytable th { width: auto; padding: 2px 4px; vertical-align: top; } table.mytable th { color: #fff; background:url(images/header-bg.gif); text-align: left; } table.mytable tr.alternateColor { background-color:#E9F3FC; } well, it works, if I do write it manually. But as the tables are going to be generated thru asp.NET (Aspx) , which is not manually created- I'd like my table to generate the alternate rows. I've been trying to make this work with Javascript, but I can't figure it out and I believe this is a good resource site. I've been using a manual table with Adobe Dreamweaver cs4 as a test, but I have to put the class of "alternatecolors" in order to make them appear, and I can't do this normally.: Question is , can someone provide me a good Javascript that I would put in the header of the file, and actually help me out to make this work ? I think I'm burned...or maybe I can't see what others see quickly due to the amount of time I've spent. I just tried posting the code of my table here, but I couldn't get it well formatted and I got to run... I'm not using an 'id' on this table, but the class is 'mytable'. Thank you so much for your good help.

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  • Visual Studio Formatting -- Change Method Color

    - by Daniel
    The default appearance of a method for example, ".ToString()" is by default the color black. I want to make it a different color to stand out but I do not see any options that reference this option specifically. I remember one of former collegues showing me his VS IDE years ago and he had it setup this way but I cannot recall what he did. Does anyone have any ideas on how to do this?

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  • Printing to STDOUT and log file while removing ANSI color codes

    - by Arrieta
    I have the following functions for colorizing my screen messages: def error(string): return '\033[31;1m' + string + '\033[0m' def standout(string): return '\033[34;1m' + string + '\033[0m' I use them as follows: print error('There was a problem with the program') print "This is normal " + standout("and this stands out") I want to log the output to a file (in addition to STDOUT) WITHOUT the ANSI color codes, hopefully without having to add a second "logging" line to each print statement. The reason is that if you simply python program.py > out then the file out will have the ANSI color codes, which look terrible if you open in a plain text editor. Any advice?

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  • Fade a color to white (increasing brightness)

    - by Jon B
    I want to make a text box in .NET "glow" yellow, and then "fade" to white (basically, by incrementally increasing the brightness). I think Stackoverflow does this after you've posted an answer. I know that increasing brightness is not all that simple (it's not just uniformly increasing/decreasing RGB), but I'm not sure how to do this. Perfect color accuracy is not important for this. I am using C#, although VB examples would be just fine, too. Edit: This is for Winforms.

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  • How to generate spectrum color palettes

    - by ddimitrov
    Is there an easy way to convert between color models in Java (RGB, HSV and Lab). Assuming RGB color model: How do I calculate black body spectrum color palette? I want to use it for a heatmap chart. How about single-wavelength spectrum? Edit: I found that the ColorSpace class can be used for conversions between RGB/CIE and many other color models.

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  • How to change Gmap markers color?

    - by user191687
    Hi! I've a custom google map with different points: Markers[0] = new Array(new GMarker(new GLatLng(45.0, 9.0)), "Location1", "<strong>Address Line</strong><br/>Some information"); Markers[1] = new Array(new GMarker(new GLatLng(45.0, 12.0)), "Location2", "<strong>Address Line</strong><br/>Some information"); etc. Simply I want to change the color of the markers from the default red. I.E. the 2nd blue. How to do this?

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  • Changing the Settings item description text color in Android?

    - by Cori
    I use a Samsung Vibrant, and one of the annoying bits that Samsung tossed on their TouchWiz skin was changing the color of the Settings menu item description text from white (AOSP) to light blue. This looks okay as long as the skin is bluey-themed, but most ROMs seem to be leaning toward Gingerbread clones... doesn't look good with the green. How can I change that settings description font color back to white, or even the orange it is in actual Android 2.3? Which xml file is the color property located in? It seems to also spread to all apps you install, too... the blue text.

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  • Color scaling function

    - by Tomas Pajonk
    I am trying to visualize some values on a form. They range from 0 to 200 and I would like the ones around 0 be green and turn bright red as they go to 200. Basically the function should return color based on the value inputted. Any ideas ?

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  • Why is png file looks different in firefox?

    - by ablmf
    If you take screen shot this web page in different browser, you'd see that it displays slightly different in firefox. (7.01, ubuntu) At first I thought it was because of color profile, but even if I turned on color management in firefox, the problem is still there. Although it's not a very noticeable problem, I got a perfectionist boss who asked to make it look exactly the same in every browser. Does any one know what might have caused the problem? Thanks!

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  • How to use this Color's constructor? Java

    - by MaxMackie
    According to Oracle's site, the class Color has a constructor that accepts a single int value which represents an RGB value. http://download.oracle.com/javase/1.4.2/docs/api/java/awt/Color.html#Color(int) An RGB color is actually three different numbers ranging from 0-255. So combining them together to make one int would look like this: White 255,255,255 White 255255255 Right? So I pass this to the constructor and get a vibrant teal color. What am I doing wrong? What haven't I understood?

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  • C# public partial struct methods for more System.Windows.Media.Color

    - by dr d b karron
    How can I put in additional methods for manipulating color ? Best would be to overload the struct System.Windows.Media.Color. It is NOT a class (in c#). Now i'm tinkering with putting (in the same file for testing or must i put it in a different file) an namespace (Silverlight Application36 or System.Windows.Media ?) and a partial struct Color Normalize (double R, ...). I should see MyColor.Normalize() start being recognized by intellisense ? I'm not. I'm looking to put in a suite of overloaded color manipulations using floating and double numbers instead of unsigned byte integers. Any hints while I wack at it ? Cheers! dr.K

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  • OpenGL 3.3 different colours with fragment shader [solved]

    - by Andrew Seymour
    I'm an OpenGL newbie. I'm trying to colour 3 circles but only 3 white circles are appearing. n is 3 in this example. Each vertice has 5 points, 2 for position and 3 for color Here is where I think a problem may lie: glEnableVertexAttribArray(0); glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer); glVertexAttribPointer( 0, 2, GL_FLOAT, GL_FALSE, 5*sizeof(float), (void*)0 ); glEnableVertexAttribArray(1); glVertexAttribPointer( 1, 3, GL_FLOAT, GL_FALSE, 5*sizeof(float), (void*)(2*sizeof(float)) ); glDrawElements(GL_TRIANGLES, 20 * 3 * n, GL_UNSIGNED_INT, 0); glDisableVertexAttribArray(0); glDisableVertexAttribArray(1); My shaders: #version 330 core in vec3 Color; out vec4 outColor; void main() { outColor = vec4(Color, 1.0); } #version 330 core layout(location = 0) in vec2 position; layout(location = 1) in vec3 color out vec3 Color void main(){ gl_Position = vec4(position, 0.0, 1.0); Color = color; } Thanks for taking a look Andy EDIT: layout(location = 1) in vec3 color out vec3 Color layout(location = 1) in vec3 color; out vec3 Color;

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