 Sometimes we need to use the RGB(red,green,blue) color numbers to achieve the effect we want. The RGB colors can have a transparent factor too which you can see in the image above. You can find the RGB numbers by using a Hex converter. Color Converter If you have an image and you want to match a color within it with RGB, the color-grabber wiii give you the hex number and the RGB numbers. Color Grabber. The RGB color numbers can be used anywhere color is called for at IM. You can make a background, fill color,stroke color, and paint using RGB. Here's how you would enter the RGB numbers for the color "Firebrick" whose numbers are 178,34,34.
Transparency for the RGB numbers is a value ranging from 0.2 to 1.0. This value is added as the fourth value inside the parenthesis. NOTE the "a" added to rgb...This stands for Alpha Channel which is transparency.
Below is an example of the different transparency values in fill color. Stroke color is true Firebrick. NOTICE how transparency value of 1.0 is true Firebrick.  Transparency for the HEX numbers is a value ranging from 20 to 100. This value is added as the fourth value. Here's how you would enter the HEX numbers for the color "Firebrick" whose numbers are #B22222
Below is an example of the different transparency values in fill color. Stroke color is true #B22222. NOTICE how transparency value of 100 is true Firebrick. 
| |||||||