Gimp Chapter 2

Name:

Alina Cancel

Student Number:

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? Yes, it make all smaller.

2.      Why should you scale images you take on a digital camera before sending them in email or posting them on the web? So the picture would load a lot 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? Because It prevents the contents of the photo from getting taller and skinner, or shorter or fatter. Make sure the width and height are chain liked together.

4.      What is the keyboard shortcut to UNDO? ctrl z

5.      What does the SCALE TOOL do? Let you scale interactively by going on the layer clicking on a corner and dragging into the image.

6.      What is the difference between the IMAGEàSCALE from the menu and the SCALE TOOL? The Scale tool needs to be started by user and it only works on the current. Image Scale- scales the whole image

7.      Describe these JPG quality settings: ·         Optimize gives you an additional reduction in file size without any further reduction in the image quality. ·         Progressive let you see a poor-quality version of the picture on the web right away, which gradually improves ·         Save EXIF data embeds a thumbnail of the image into a file. ·         Comment is a place to put any text you might want to add to an image.

8.      Why would you decrease the quality setting of a JPG image? So it would take less space and load faster.

9.      Compare the size of a 95% quality setting to a 100% setting of a JPG image. 95% has the quality as 100% be is two or three times smaller.

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! It does not, to save without losing PNG or TIFF should be used.

11.  Describe what it means when you INDEX a file such as a GIF or PNG file. It means the files can be much smaller by reducing the number of color they use.

12.  What is RGB color mode? A Set of colors that will be represented in the final image.

13.  What is dithering?  Combines several colors in the palette to simulate colors that aren’t there.

14.  What is grayscale mode? For black and white documents or photographs, or simply for converting color to black and white.

15.  What does interlacing a file do? Allows an image to be viewed before it has been loaded completely on the web.

16.  What is cropping?  Cuts out an area that is not needed.

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 Joint Photographic Experts Group is great for full-color photographs because they are highly compressed and are encoded in full color.

2.      GIF Graphics Interchange Format, it an indexed format meaning it uses a fixed list of colors instead of encoding every color.

3.      PNG offer two modes it can be used in full color image or indexed images.

4.      XCF is a GIMP format, and should be used to keep layers and paths are other information you want to save.

5.       TIFF Tagged Image File Format is another full-color, non lossy format.

6.      Raw is a term encompassing all the various proprietary formats used by camera manufacturers.

7.      BMP it a Microsoft’s Windows Bitmap format files are quite large and don’t offer any advantage.

8.      PSD is Adobe’s Proprietary Photoshop format it saves layer and other information.

9.      ICO is a Microsoft Windows Icon Format is can contain several resolutions in one file.

10.  PDF is a vector graphics format. It a collection of drawing instructions involving points, lines and curves.

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: let you control the images brightness and contrast but using to sliders the represent each one

·         Levels: has two set of controls Input level and output level both slider make the image lighter or darker.

·         Curves: does the same as Levels but in a different way it uses a horizontal bar graph the represents input values.

·         Threshold: shows a histogram of the image’s brightness.

·         Desaturation: removes the colors from the image, changing it to a grayscale image without requiring you convert to grayscale mode.

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: