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  • linearRGB conversion to/from HSL

    - by Otaku
    Does anyone know of a way to get HSL from an linearRGB color (not an sRGB color)? I've seen a lot of sRGB<-HSL conversions, but nothing for linearRGB<-HSL. Not sure if it is fundementally the same conversion with minor tweaks, but I'd appreciate any insight someone may have on this. Linear RGB is not the same as linearizing sRGB (which is taking [0,255] and making it [0,1]). Linear RGB transformation from/to sRGB is at http://en.wikipedia.org/wiki/SRGB. In VBA, this would be expressed (taking in linearized sRGB values [0,1]): Public Function sRGB_to_linearRGB(value As Double) If value < 0# Then sRGB_to_linearRGB = 0# Exit Function End If If value <= 0.04045 Then sRGB_to_linearRGB = value / 12.92 Exit Function End If If value <= 1# Then sRGB_to_linearRGB = ((value + 0.055) / 1.055) ^ 2.4 Exit Function End If sRGB_to_linearRGB = 1# End Function Public Function linearRGB_to_sRGB(value As Double) If value < 0# Then linearRGB_to_sRGB = 0# Exit Function End If If value <= 0.0031308 Then linearRGB_to_sRGB = value * 12.92 Exit Function End If If value < 1# Then linearRGB_to_sRGB = 1.055 * (value ^ (1# / 2.4)) - 0.055 Exit Function End If linearRGB_to_sRGB = 1# End Function I have tried sending in Linear RGB values to standard RGB_to_HSL routines and back out from HSL_to_RGB, but it does not work. I have seen almost no references that this can be done, except for two: A reference on http://en.wikipedia.org/wiki/HSL_and_HSV#cite_note-9 (numbered item 10). A reference on an open source project Grafx2 @ http://code.google.com/p/grafx2/issues/detail?id=63#c22 in which the contributor states that he has done Linear RGB <- HSL conversion and provides some C code in an attachment to his comment in a .diff file (which I can't really read :( ) My intent is to send from sRGB (for example, FF99FF (R=255, G=153, B=255)) to Linear RGB (R=1.0, G=0.318546778125092, B=1.0) using the code above (for example, the G=153 would be obtained in Linear RGB from sRGB_to_linearRGB(153 / 255)) to HSL, modify the Saturation by 350% and going back from HSL-Linear RGB-sRGB, the result would be FF19FF (R=255, G=25, B=255). Using available functions from .NET, such as .getHue from a System.Drawing.Color does not work in any sRGB space above 100% modulation of any HSL value, hence the need for Linear RGB to be sent in instead of sRGB.

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  • Make an empty DIV height and width of its container

    - by Olly F
    My HTML currently contains a background image that stretches with the viewport. Within that, I plan to place a div that stretches to the height and width of the viewport and has black background colour at 50% opacity. I've set the div to be 100% width and height. The div is not stretching and I can't figure out why! HTML: <!DOCTYPE HTML> <html lang="en"> <head> <title>Tester</title> <meta charset="UTF-8"/> <style type="text/css"> html { background: url(http://cjpstudio.com/wp-content/uploads/2011/12/cityrock1.jpg) no-repeat center center fixed; -webkit-background-size: cover; -moz-background-size: cover; -o-background-size: cover; background-size: cover; } #background-color { width: 100%; height: 100%; background-color: #000000; } </style> </head> <body> <div id="background-color"> </div> </body>

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  • Programmatically Change Colors in C#

    - by Jason
    I am current working on a project where, as different users add text to a document, I would like the color of the text to change. Originally, I was using C#'s predefined color values and just putting the ones I wanted to use into an enum in my application and cycling through the colors as different users added annotations. This works fine, and I am okay with this solution. However, I also could have chosen to change the RGB values and derived colors that way. I'm curious about what type of algorithm would be good to change those values to get different sets of colors. This is more just an exercise of something I had thought about. To clarify a little bit, I don't want to just increment one of the color values (R, G, or B) because that wouldn't give me enough variety in my colors. But, I don't think it would also work to increment all three of equal amounts. I also have to watch out for repeating colors (up to a point). The requirements for my project anticipates, at most, 10 different reviewers.

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  • iPhone UITextField - Change placeholder text color

    - by adam
    I'd like to change the color of the placeholder text I set in my UITextField controls, to make it black. I'd prefer to do this without using normal text as the placeholder and having to override all the methods to imitate the behaviour of a placeholder. I believe if I override this method.. - (void)drawPlaceholderInRect:(CGRect)rect ..then I should be able to do this. But I'm unsure how to access the actual placeholder object from within this method.

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  • Change UITextView text color with animation.

    - by f0rz
    Hi ! Just a simple question. Is it possible to change the text color of UITextView with a animation? [UITextView beginAnimations:nil context:NULL]; [UITextView setAnimationDuration:2.0]; textView.textColor = [UIColor grayColor]; [UITextView commitAnimations]; Cheers! - Martin

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  • Jquery Knob animate and change color

    - by user1468116
    I'd like to create a knob that switch color at some point. For example, at 35 is red, at 70 is yellow and 100 is green. I also would like to make it animate. this is my fiddle: http://jsfiddle.net/Tropicalista/jUELj/6/ My code is: enter code here $(document).ready(function() { $('.dial').val(13).trigger('change').delay(2000); $(".dial").knob({ 'min':0, 'max':100, 'readOnly': true, 'width': 120, 'height': 120, 'fgColor': '#b9e672', 'dynamicDraw': true, 'thickness': 0.2, 'tickColorizeValues': true, 'skin':'tron' }) });

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  • ColumnChart google visualization column color change

    - by drozzy
    Does anyone know if I can hack google's visualization ColumnChart api chart somehow, to make a single column stand out with a different color, like so: I know you can do it with ImageChart, so I don't need that (it fires no events and has no x/y labels). Can I traverse the result with javascript somehow and change the CSS style, if it is truly rendered in SVG?

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  • Change text color in text field

    - by Syom
    I have an input text field, which has a value "something" by default, but when I start to type, I want that the default value changes color, and the text i'll type, another one. How can i do that? <input type="text" value="something" onclick="this.value=''" />

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  • Visual Studio 2010 color theme

    - by James Jones
    Has anyone found/made any decent color themes for Visual Studio 2010? My VS 2005/2008 themes seem to be getting mangled in the upgrade process. I'm accustomed to using the ever famous Oren Ellenbogen's Dark Scheme featured on Scott Hanselman's blog, but the upgrade process has made it downright butt-ugly. Does anyone have any gems they'd like to share?

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  • Get pixel's color in C++, Linux

    - by Stefan
    Hello, I'm looking for a possibility to get the color of a pixel with given screen coordinates (x,y) in c++ / Linux? Maybe something similarly like getPixel() in Windows. I spent the whole day to find sth but without any success. Thanks, Stefan

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  • change text color in button

    - by Syom
    i have an input button, which's value is "something" by default, but when i click on it, i start to type. i want, that the default value has one color, and the text i'll type, another one. how can i do that? here is the script <input type="text" value="something" onclick="this.value=''" />

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  • Background color for Tk in Python

    - by olofom
    I'm writing a slideshow program with Tkinter, but I don't know how to change the background color to black instead of the standard light gray. How can this be done? import os, sys import Tkinter import Image, ImageTk import time root = Tkinter.Tk() w, h = root.winfo_screenwidth(), root.winfo_screenheight() root.overrideredirect(1) root.geometry("%dx%d+0+0" % (w, h)) root.focus_set() root.bind("<Escape>", lambda e: e.widget.quit()) image = Image.open(image_path+f) tkpi = ImageTk.PhotoImage(image) label_image = Tkinter.Label(root, image=tkpi) label_image.place(x=0,y=0,width=w,height=h) root.mainloop(0)

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  • Change color of disabled radiobutton list element

    - by Dave
    I've got a radiobuttonlist with a bunch of list items, some of them disabled. The label control beside the radio button turns gray, which can be hard to read. How do I change the color of the label? I've tried CSS, changing the forecolor - nothing seems to work: currentButton.Attributes.Add("class", "disabled"); Any ideas?

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  • YAML in TextMate, color coding wrong?

    - by Victor P
    Im using TextMate to create a YAML document, but the keys and the values have all the same color (brown). Would be more intuitive to have keys and values rendered in different colors, like HTML, CSS, etc Am I missing something? Thanks

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  • 256 color terminal library for Ruby?

    - by brianegge
    Is there a gem like 'Term::ANSIColor' which works with 256 color terminals? The perl script 256colors2.pl works great in my terminal, and I'd like to use some of these colors in my ruby scripts without manually inserting the ANSI codes.

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  • change background color with change in mouse position

    - by Ashish Rajan
    I was wondering if it is possible to set background-color with help of mouse coordinates. What is have is: I have a DIV-A which is draggable and some other divs which are droppable. What is need is : I need to highlight other divs on my page which are droppable, whenever my DIV-A passes over them. What i have is mouse coordinates, is it possible to apply css on the bases of mouse coordinates using jquery.

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