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CSS: Core Concepts

Using RGB values


From:

CSS: Core Concepts

with James Williamson

Video: Using RGB values

No matter how you define your color in CSS, chances are it's being displayed using RGB. RGB is short for red, green and blue, and is the primary color method used by screen devices. RGB is an additive color method, featuring a mixture of red, green and blue values that range between 0 and 255. If all three are set to 255, you get white. If all the colors are removed and set to 0, you get black. CSS offers support for RGB values through two forms of syntax.
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  1. 4m 57s
    1. Welcome
      55s
    2. Using the exercise files
      4m 2s
  2. 1h 7m
    1. Exploring default styling
      4m 56s
    2. CSS authoring tools
      2m 29s
    3. CSS syntax
      4m 45s
    4. Writing a selector
      4m 10s
    5. Setting properties
      8m 40s
    6. Common units of measurement
      7m 47s
    7. Inline styles
      5m 1s
    8. Embedded styles
      5m 19s
    9. Using external style sheets
      10m 34s
    10. Checking for browser support
      8m 48s
    11. Dealing with browser inconsistencies
      5m 30s
  3. 2h 15m
    1. Structuring HTML correctly
      2m 51s
    2. Element selectors
      4m 52s
    3. Class selectors
      6m 4s
    4. ID selectors
      3m 27s
    5. Using classes and IDs
      10m 7s
    6. Element-specific selectors
      4m 35s
    7. The universal selector
      5m 42s
    8. Grouping selectors
      4m 49s
    9. Descendent selectors
      7m 32s
    10. Child selectors
      5m 7s
    11. Adjacent selectors
      5m 30s
    12. Attribute selectors
      12m 43s
    13. Pseudo-class selectors
      3m 54s
    14. Dynamic pseudo-class selectors
      8m 29s
    15. Structural pseudo-class selectors
      6m 45s
    16. Nth-child selectors
      13m 10s
    17. Pseudo-element selectors
      12m 40s
    18. Targeting page content: Lab
      8m 56s
    19. Targeting page content: Solution
      7m 59s
  4. 42m 39s
    1. What happens when styles conflict?
      4m 0s
    2. Understanding the cascade
      5m 47s
    3. Using inheritance
      6m 11s
    4. Selector specificity
      6m 55s
    5. The !important declaration
      4m 5s
    6. Reducing conflicts through planning
      3m 33s
    7. Resolving conflicts: Lab
      6m 45s
    8. Resolving conflicts: Solution
      5m 23s
  5. 1h 47m
    1. Setting a font family
      7m 10s
    2. Using @font-face
      9m 18s
    3. Setting font size
      7m 35s
    4. Font style and font weight
      6m 52s
    5. Transforming text
      3m 58s
    6. Using text variants
      2m 49s
    7. Text decoration options
      4m 26s
    8. Setting text color
      3m 2s
    9. Writing font shorthand notation
      8m 49s
    10. Controlling text alignment
      6m 33s
    11. Letter and word spacing
      9m 11s
    12. Indenting text
      4m 30s
    13. Adjusting paragraph line height
      10m 30s
    14. Controlling the space between elements
      6m 41s
    15. Basic text formatting: Lab
      8m 45s
    16. Basic text formatting: Solution
      7m 14s
  6. 2h 1m
    1. Understanding the box model
      16m 53s
    2. Controlling element spacing
      14m 29s
    3. Controlling interior spacing
      10m 49s
    4. Margin and padding shorthand notation
      6m 27s
    5. Adding borders
      8m 57s
    6. Defining element size
      10m 7s
    7. Creating rounded corners
      6m 58s
    8. Background properties
      2m 51s
    9. Using background images
      5m 10s
    10. Controlling image positioning
      10m 25s
    11. Using multiple backgrounds
      7m 5s
    12. Background shorthand notation
      5m 25s
    13. Styling container elements: Lab
      7m 55s
    14. Styling container elements: Solution
      8m 17s
  7. 47m 51s
    1. Color keyword definitions
      5m 4s
    2. Understanding hexadecimal notation
      6m 5s
    3. Using RGB values
      4m 58s
    4. Using HSL values
      5m 17s
    5. Working with opacity
      2m 23s
    6. Using RGBa and HSLa
      3m 8s
    7. Styling drop shadows
      5m 38s
    8. CSS gradients
      6m 32s
    9. Working with color: Lab
      4m 26s
    10. Working with color: Solution
      4m 20s
  8. 1m 58s
    1. Additional resources
      1m 58s

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CSS: Core Concepts
8h 49m Beginner Nov 22, 2011

Viewers: in countries Watching now:

In this hands-on course, James Williamson demonstrates the concepts that form the foundation of Cascading Style Sheets (CSS), including styling text, adding margins and padding, and controlling how images display. The course also explores the tools needed to work with CSS, the differences between embedded and external styles, how to use selectors to target elements, and what to do when styles conflict.

Topics include:
  • Exploring default styling
  • Writing a selector
  • Setting properties
  • Working with common units of measurement, including ems and pixels
  • Structuring HTML correctly
  • Understanding the cascade and inheritance
  • Setting a font family, font size, text color, and more
  • Understanding the box model
  • Styling container elements
  • Working with RGB vs. HSL values
  • Styling drop shadows
Subject:
Web
Software:
CSS
Author:
James Williamson

Using RGB values

No matter how you define your color in CSS, chances are it's being displayed using RGB. RGB is short for red, green and blue, and is the primary color method used by screen devices. RGB is an additive color method, featuring a mixture of red, green and blue values that range between 0 and 255. If all three are set to 255, you get white. If all the colors are removed and set to 0, you get black. CSS offers support for RGB values through two forms of syntax.

So let's go ahead and experiment with using both. To do that, we are going to open up the rgb.htm file. You can find that in 06_03 folder. And very similar to the file we worked with last time, we have a headline and then a little bit of a description, in a paragraph underneath that about RGB values. And we are going to use that paragraph selector again. We have place holders for background value and the color value. And so we are going to use both of these to experiment with the RGB syntax. Okay, so the defined color as RGB, the first thing that we do is enter rgb(); So and in the parenthesis we pass in the value that we want the browser to render.

Now the first form of syntax I am going to show you guys involves with using percentages. So we have three values that we are going to pass, the red value, the green value and the blue value. Now if you're using percentages you are going to pass them as a value between 0 and 100%. Even more importantly, you have to remember to add a percentage sign so, let's do something like (45%,70%,20%); Okay, now do you have any idea of what that color is going to be, neither do I.

But I do notice that we need commas between those declarations as well guys. So remember, that's the red value, that's the green value and that's the blue value. So, essentially we are going to have sort of a medium red value, a very bright green value added to this and then a very, very dark or low amount of blue inside this color. So if I save this, and preview this in a browser, I can see the color we are getting there. We are getting a green so as I mentioned before, very bright green value, very little in terms of red or blue.

Now, you may have noticed something here. We went ahead and previewed this in the page without defining a color for the paragraph. Now other than just having really bad syntax right here because I didn't pass a value in, basically it's getting the default colors, it's inheriting the default color of the device, in which case it's almost always going to be black. Now let's play around a little bit with the syntax here. Now let's try something a little bit lower. Let's go to an rgb value of (rgb(20%,30%,50%;);). So we are lowering the values of all of those and as I test this color, you can see that we are getting a much darker blue, little less saturated there.

Now I won't sit and tell you that hey I have got some of this percentage values memorized, I do not. But you can't make an educated guess based on the amount of the specific color you are placing in this. Now, the other syntax and this is probably the more common syntax that you are going to see, follows essentially the same script, you type in rgb, and then you have your parenthesis and then inside that, you pass in absolute values that range from 0 to 255 so that gives you the full range of 256 colors available to you, for each color channel in rgb.

So we are going to start with the red value, let's say we pass in 125. If in the green value we passed in let's say 244 and in the blue value, we passed in something like 15. That's going to give us probably a pretty bright green. So if I save this and test it, indeed we get that really bright green color. Now remember, if we want white, all we have to do is type in (255, 255, 255); So you just have to remember that the upper range of the color is 255, the lower range would be zero so if you go in for black it would be 0, 0, 0.

You also have to remember the commas between them, so if I save this and refreshed it. Now we are getting white there. I'm sure by this point that some of you are wondering, hey, can I mix these values, can I come in and say okay I want 10% here and then 255 and 255. Well if I save this and test it, the answer is no, not really. Some browsers do implement that. So some browsers do allow you to mix these colors like this, but does not recommend in practice so, usually stick with one syntax or the other.

I just like hexadecimal notation, the overall syntax is pretty basic but you are also unlikely to memorize a lot of these colors, so you're probably going to find yourself using a tool like Kuler or one of your desktop based tools to let you know what the RGB values for a particular color is. Now we have one more color mode to inspect and that is the HSL color mode and that's one that actually can be a little bit more intuitive in terms of mixing colors together on the fly, so we're going to check that out in the next movie.

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