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.
You probably need to strip the alpha values off when using it in HTML, since the color tags don't support it. You also may or may not need the pound sign before using hex values for color. So you want #000040 instead of #FF000040.
You can use this website.
You can also use Visual Color Picker, an excellent program.
Ignore the first 2 letters (ff) of the color: ff000040. This is the alpha value and ff means it's opaque. So the real color is #000040. You can see it like this:
<div style='width:100px;height:100px;background-color:#000040'></div>
The A in ARGB stands for alpha (the opaqueness/transparency of the image) - CSS styles use RGB by default. You can programmatically generate the colour with the alpha or use CSS/HTML to generate the colour after dropping the alpha (#000040).
You can use the System.Drawing.ColorTranslator to convert your colour to HTML. It has a .ToHtml() method that is what you need in your original example.
For example, to see a named color, you could do:
ColorTranslator.ToHtml(Color.SaddleBrown)
and put it into your web page as you have shown.
The VS debugger is in ARGB order.
CSS is in RGBA order: (A stands for Alpha, which is from 0 ( invisible ) to 255 ( opaque )
Try this:
<html>
<div style="background: rgba(0, 0, 64, 1.0);">________<div>
<h1 style="background-color: #000040">hello</h1>
</html>
As far as I know, you can't specify opacity with hexcode color ( the second example ). At least, it doesn't work in FF.
A Debugger Visualizer for the System.Drawing.Color type can be obtained here: http://code.google.com/p/colorvisualizer/ or even here: http://www.codeproject.com/KB/macros/ZetaColorVisualizer.aspx