Courtney Cloud: Digital Graphics: Gimp: Chapter 8

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Courtney Cloud

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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- Combinations of Red Blue and Green

· Subtractive color- Shades of Colors

· HSV color- Hue Saturation and Value

· CMYK color- Three colors and black. Used for printers.

2. What is the relationship between additive and subtractive color? They are mirrored image of each other. (exact opposites)

3. How many bits do most computers use to represent color? They use three per pixel.

See the Important Note below regarding bit color.

4. What is the TRIANGLE COLOR SELECTOR used for? It’s an alternate HSV color interface.

5. What is the TRIANGLE COLOR SELECTOR used for? It is used for the selection of color.

IMPORTANT NOTE:

In GIMP, the bit break-down is:

· RGB Channel: 8 bits for RED, 8 bit for GREEN, 8 bits for BLUE

· ALPHA Channel: 8 bits for TRANSPARENCY

About TRANSPARENCY :

An Alpha value indicates the transparency of a pixel. Besides its Red, Green and Blue values, a pixel has an alpha value. The smaller the alpha value of a pixel, the more visible the colors below it [the greater the transparency]. A pixel with an alpha value of 0 is completely transparent. A pixel with an alpha value of 255 (or Hex ff) is fully opaque.

With some image file formats, you can only specify that a pixel is completely transparent or completely opaque [JPGs are always opaque]. Other file formats allow a variable level of transparency [such as GIF and PNG].

From the GIMP Glossary: http://docs.gimp.org/en/glossary.html

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: bright 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: