Name:

Tovah Lukken

Student Number:

X00015848

GIMP: Chapter 8: Color

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

1. Answer all questions below, briefly but completely.
2. Change the color of the answer to Pink.
3. Copy this information and paste in a new post in your DIGITAL GRAPHICS blog.

1.       Briefly define the following color terms:

·         Additive color: A combination of red, green and blue lights in reference to computer monitors in depiction of color.

·         Subtractive color: Addition of shades of paint on a reflective surface making the image darker; reflected color.

·         HSV color: Hue, Saturation and Value. Uses three numbers to represent each color but not splitting the image into separate components. Hue: Where the color falls in the spectrum 0-360; Saturation: Intensity of color 0-100; Value: Brightness of pixel 0-100.

·         CMYK color: Printing color space, addition of “k.”

2.       What is the relationship between additive and subtractive color? Additive and Subtractive colors are opposites, they “mirror” each other.

3.       How many bits do most computers use to represent color? 24-bit color: 8 bits per color channel.  See the Important Note below regarding bit color.

4.       What is the TRIANGLE COLOR SELECTOR used for? In reference to HSV, instead of a vertical slider, hue is represented by a circle with two drag handles (the small rings), one to choose hue and the other to choose saturation and value; black corner reduces value, white, saturation.

5.       What is the TRIANGLE COLOR SELECTOR used for? See above answer.

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: High 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:

I had trouble with finding the Calligraphy brush, but once I figure it out, I will post this one!

2.      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: