WEEK 2 - DAY 3 Colour

COLOUR CONTINUED... Describing Colors

HSB

Even though we can see colors accurately, it is very difficult to describe them without a reference point to relate them to. That is what color measurement is designed to do

To accurately describe colors for color matching, especially when we delve into the world of digital imaging and color management, we need a more reliable method. In order to describe a specific color, we need to break it down into three elements:

• Hue is the actual color. It is measured in angular degrees counter-clockwise around the cone starting and ending at red = 0 or 360 (so yellow = 60, green = 120, etc.).

• Saturation is the purity of the color, measured in percent from the center of the cone (0) to the surface (100). At 0% saturation, hue is meaningless.

• Brightness is measured in percent from black (0) to white (100). At 0% brightness, both hue and saturation are meaningless.

By using these three measurements, any color can be described so that it can then be recreated accurately throughout an imaging system. An understanding of these measurements will help you to understand the relationships between the colors in the scene that you are photographing and how these will be reproduced in the final image.

RBG

This is the scheme that you will use most often when you are dealing with colors on a computer monitor—in graphics packages, in programming, or in Web pages. RGB describes colored light which is viewed coming from its source (colored light bulbs in a theater, the colors of a video display, or reflection from a white object). It is called an additive color system, since you add light from the primary colors to make new colors.

The values for red, green, and blue commonly use a scale or measurement from 0–255. All modern video cards, which are capable of 16M colors, use one byte each (per pixel) for the R, G, and B values, so the 0–255, higher numbers mean more of each color of light. 

ACTIVITY 1

STEP 1: Using the photographs you took on your Hamilton Market field trip, select 3 images, each image should:
- feature one main chromatic colour
- establish the rate of saturation in the colour, i.e. how much black, gray or white is in the mix
- establish the colour luminance, i.e. how much light is emitted from the colour 
- establish the RGB values from 0 to 255

STEP 2: GET COLOUR VALUES: You will do this by opening your image in Photoshop Element and using the eyedropper tool to get a colour read. 
SKILL 1: OPEN PHOTOSHOP FILE: Select Photoshop Elements option from the START menu, use the EDIT option to open a image.
SKILL 2: PHOTOSHOP EYE DROPPER TOOL: One the left hand side of the Photopshop workspace, you will a tool bar,
SKILL 3: SCREEN SNAPSHOT: You can take a snaphot of the Photoshop colour chart, you can do this by [Alt] + [PrtSc] then paste into your slide show.
SKILL 4: CROP TOOL in GOOGLE SLIDES: You will need to use the CROP tool in Google Slides as well to remove parts of your screen snapshot.

STEP 3: Using the WEEK 2 Google slide show you created yesterday add 3 new pages. On each page include the image you selected with the RGB and HSB colour features described, feel free to use your screen snapshots to do this.