Michele Keller: Digital Graphics: GIMP: Chapter 8-Color

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Michele Keller

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GIMP: Chapter 8: Color

PART 1: READ Chapter 2 in the GIMP book, then:

Answer all questions below, briefly but completely.
Change the color of the answer to BLUE.
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1. Briefly define the following color terms:

· Additive color: Each pixel in a computer monitor is a combination of Red, Green, and Blue lights. These colors make up a multitude of combinations.

· Subtractive color: As colors of transmitted light get added, the image gets brighter, but as you add shades of paint to a reflecting surface, the image get darker—that is subtractive color.

· HSV color: Hue, Saturation, and Value—uses three numbers to represent each color. Hue—is measured by where it falls in the spectrum, Saturation—is the intensity of the color, and Value—is how bright the pixel is, from 0-100.

· CMYK color: This controls how much black color gets used in media print.

2. What is the relationship between additive and subtractive color? They mirror each other when selecting color. The more color you add on one end of the spectrum, you will get white, on the other end you will get black.

3. How many bits do most computers use to represent color? Modern computers most often use 32 bits to represent a pixel.

4. See the Important Note below regarding bit color.

4. What is the TRIANGLE COLOR SELECTOR used for? Provides an alternate HSV interface. Hue is represented by a circle.

5. What is the TRIANGLE COLOR SELECTOR used for? Alternative to the HSV interface.

PART 2: GIMP PROJECT:

1. HEX Web Colors: Go to this link to find more about web colors: http://en.wikipedia.org/wiki/Web_colors

From the information in this Wiki article, analyze the following hex values and describe what color of each (the first is done for you):

A. #cc22cc Color: purple (Notice the high RED and high BLUE values)

B. #ff0000 Color: Red

C. #0000bb Color: Blue

D. #000000 Color: Black

E. #11ff11 Color: Green

F. #999999 Color: Grey (What color is it when all the hex digits are the same?)

2. HEX Web Colors Image:

· Now open GIMP and create a new 600 X 600 art canvas.

· Choose the BRUSH Tool.

· Click on the Foreground Color Picker at the bottom of the Toolbox and type in the first color (#cc22cc) from the list above.

· Use a calligraphic brush to draw out the word PURPLE across the canvas. See the sample here à

· Create a new layer.

· Now enter the second color above (#ff0000) in the Color Picker, and draw out the appropriate color word with the Brush on the new layer.

· Continue adding new layers with the appropriate color names for each of the colors above. (The color words can overlap, be at angles, be different sizes, different transparencies, etc. You can also add brush decorations, shapes, etc. if you like to create an interesting, attractive image.)

· Save the image as a JPG in your GIMP folder with the file name Hex Colors

· Delete the sample image (“Purple”) and insert your own Hex Colors image here:

3. Color Adjustments:

· Go to the web site for this book: http://gimpbook.com

· Click on the PHOTOS FROM THE BOOK link, and scroll down to see the images for Chapter 2.

· Download and save these images: Yosemite Storm, the yellow flower, Dave (image of man at a table, right after the yellow flower image), and the Shakespeare page.

· With the images you downloaded, follow the instructions in pages 303 through 319 to adjust various color properties. You do not have to complete the entire chapter; you may stop just before Indexed Color on page 219. (Of course, you are more than welcome to complete the chapter if you like.)

· After the adjustments, save the final version of the images, then insert the final adjusted images here:

Yosemite Storm: Correcting Color Balance