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How can I enter RGB or Hex color values for backgrounds in Interface Builder? I can select predefined colors but I would like to manually enter in RGB values. Where can I do this?
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Another example, rgb(0, 255, 0) is displayed as green, because green is set to its highest value (255), and the other two (red and blue) are set to 0. To display black, set all color parameters to 0, like this: rgb(0, 0, 0). To display white, set all color parameters to 255, like this: rgb(255, 255, 255).
First, choose the color you want changed in the browser. Then move the red, green, and blue sliders until you get the desired color. There are a few additional buttons to help you do this. The white button makes the color white (red = blue = green = 1.0) and the black color makes it black (red = blue = green = 0.0).
RGB color space The red, green and blue use 8 bits each, which have integer values from 0 to 255. This makes 256*256*256=16777216 possible colors. Each pixel in the LED monitor displays colors this way, by combination of red, green and blue LEDs (light emitting diodes).
Click on the color slider icon, and then choose "RGB Sliders" from the drop-down list.
You can also use the magnifying-glass as a color picker to pick up an exact color from anywhere on the screen; also see @ken's excellent comment below clarifying how colorspaces work with the magnifying glass.
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Although Tyler's response answers the question, you may encounter issues using the picker because it uses the display's colorspace (as clarified by Ken).
If you want to match RGB values between Photoshop and Xcode exactly (without conversion between colorspaces) then you need to save your images in generic RGB and enter any dropper values using the generic RGB colorspace.
More info here, including how to match screenshots.
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