GIMP Ch. 2

Name:

Lesli Ferra

Student Number:

7

 

GIMP: Chapter 2: Improving Digital Photos

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 BLUE.
3. Copy this information and paste in a new post in your DIGITAL GRAPHICS blog

1.     What happens to an image when you SCALE it? Does the canvas size change when you SCALE an image? When we scale an image we make it smaller, but the canvas size is not affected.

2.     Why should you scale images you take on a digital camera  before sending them in email or posting them on the web? Smaller images load faster.

3.     Why is it important to make sure the width and height of an image you are going to scale are linked together? How do you do this in GIMP? The image would be altered or distorted.

4.     What is the keyboard shortcut to UNDO? Ctrl+Z

5.     What does the SCALE TOOL do? It lets one scale interactively.

6.     What is the difference between the IMAGEàSCALE from the menu and the SCALE TOOL? It only works on the current layer, and we end up with a funhouse mirror effect.

7.     Describe these JPG quality settings: ·       Optimize: Reduces file size without losing quality ·       Progressive: Helpful for picture that are going to be uploaded online; gradually improves the image as it downloads, rather than line by line. ·       Save EXIF data: Has the ability to add data about a certain picture. ·       Comment: A place to add text to a picture.

8.     Why would you decrease the quality setting of a JPG image? Decreasing the quality of an image would make it so it takes up less space.

9.     Compare the size of a 95% quality setting to a 100% setting of a JPG image: Using the 100% will produce a file two or three times larger than setting of 95%

10.  If you save a JPG file at 100%, do you preserve ALL the data in the image? What formats should you use if you want to preserve all the data? No, even using a 100% will still loose data sometimes. One should safe as a PNG or TIFF

11.  Describe what it means when you INDEX a file such as a GIF or PNG file. When you INDEX a file it means that you use a fixed number of colors, this helps to make the size of the picture smaller.

12.  What is RGB color mode? This mode uses different combinations of red, blue, and green to make unique effects.

13.  What is dithering? This combines pixels of several colors and creates different effects.

14.  What is grayscale mode? Desaturation of an image.

15.  What does interlacing a file do? Interlacing allows an image to lad in different ways

16.  What is cropping? In a sense cutting a picture so you can have only what you want.

 

Briefly describe these graphic file types: NOTE: It is important to learn these types of files to be a proficient graphic artist, so pay attention when you describe these file types.

1.     JPEG: Best for sharing full-color photos, but not for editing over and over.

2.     GIF: Uses a fixed list of colors, it is very efficient for images with small number of colors like a five color porate logo. GIF however, doesn’t allow for partial transparency; a pixel is either fully transparent or not at all.

3.     PNG: Has two modes; it can be used for full-color images, though not as efficient as JPEG. Older browsers will not support basic PNG, so they may not display properly. Also animation is not supported.

4.     XCF: GIMPS own format. A lot of layers. They are very large. Only GIMP recognizes them.

5.     TIFF: Another full-color non lossy format. Not very compact.

6.     Raw: Used by camera manufacturing.

7.     BMP: Quite large and don’t offer any advantage over PNG or TIFF, only safe in this format when you need to if not use a different format.

8.     PSD: Saves layers and other information, PSD is really two formats.

9.     ICO: Can contain several resolutions in one file, GIMP can read and write ICO files directly.

10.  PDF : Vector graphics formats, not pixel graphics. GIMP cannot edit vector graphics directly.

 

PART 2: GIMP PROJECT: Be sure to save these images in your GIMP folder before inserting them in this document.

1.     Go to the web site for this book: http://gimpbook.com 2.     Look through the menus on the left to see the supplemental information provided for you about the book. 3.     Click on the PHOTOS FROM THE BOOK link, and scroll down to see the images for Chapter 2. 4.     Download and save these images: Red Rock Canyon (the 4th image), Canyonlands (5th image),  American kestrel (the bird), Ethan (the little boy). 5.     With the Red Rock Canyon image, apply the following color techniques as indicated in the textbook on pages 38-50 (try dragging the sliders in each dialog box to see how they change the image, then UNDO to restore the image back to the original), then DESCRIBE what each does:

·       Brightness- Contrast: Lightens and brightens the photo

·       Levels: Lightens and brightens the photo. Uses a slider.

·       Curves: Lightens and brightens the photo. Uses graphs and a mobile line.

·       Threshold: Changes the photo to black and white. Slider adds darkness.

·       Desaturation: Changes the photo to only shades of gray.

6.     When you have applied these techniques to the Red Rock Canyon image, apply THRESHOLD to the image, save it, then insert it here:

7.     With the Canyonlands image, use Rotation to adjust the image as indicated on pages 51-55. Save the rotated and insert here:

8.     With the Kestral image, use the Sharpening techniques indicated on pages 55-59. Save the sharpened image and insert here:

9.     With the little boy, Ethan, image, correct the Red-Eye as indicated on pages 61-66. Save the corrected image and insert here: