Name:
|
Tovah Lukken
|
Student Number:
|
X00015848
|
GIMP: Chapter 2: Improving Digital Photos
PART 1: READ Chapter 2 in the GIMP book, then:
- Answer all questions below, briefly but completely.
- Change the color of the answer to GREEN.
- 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? No, it gets smaller; it does not change the canvas size.
|
2. Why should you scale images you take on a digital camera before sending them in email or posting them on the web? The higher resolution makes for larger files of .5 megabyte each or more.
|
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? It prevents the photo from getting talker, skinner, shorter, fatter. Type height, width number into field then tab; it will auto update.
|
4. What is the keyboard shortcut to UNDO? CTRL-Z.
|
5. What does the SCALE TOOL do? Scale interactively, without having to enter numbers.
|
6. What is the difference between the IMAGEàSCALE from the menu and the SCALE TOOL? Entering height, width dimensions vs. scaling interactively.
|
7. Describe these JPG quality settings:
· Optimize: Gives you an additional reduction in file size without reduction of image quality.
· Progressive: For images that will be uploaded to the web, image will be seen in poor quality immediately and it will gradually improve rather than being seen line by line as it loads.
· Save EXIF data: Exchangeable image file format saves information about an image such as the date, resolution, lens focal strength, if a flash was used. This can be de-selected.
· Comment:
|
8. Why would you decrease the quality setting of a JPG image? By decreasing the quality setting, you can have a smaller file size, but still a good-looking image.
|
9. Compare the size of a 95% quality setting to a 100% setting of a JPG image: Quality between an image at 95% and 100% won’t be much better, however the file size of an image set at 100% is 2-3 times larger than at 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, at 100% data is still lost. To save all data, you can save under formats PNG or TIFF.
|
11. Describe what it means when you INDEX a file such as a GIF or PNG file: It means that you are controlling the file size by controlling the number of colors used.
|
12. What is RGB color mode? RGB means full color.
|
13. What is dithering? It is a combining of pixels of several different colors. Used with indexing.
|
14. What is grayscale mode? It is used with black and white scanned photos or documents and can be used to convert color photos to black and white.
|
15. What does interlacing a file do? It allows a photo to load a certain way so that if it is being viewed on the web it can be seen prior to being completely loaded.
|
16. What is cropping? Cropping allows you to edit you image but “cutting” what you don’t want, out. You can also use it with layering to make the outside boundaries transparent.
|
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: Use when sharing full color photos, but it is not recommended for files that you plan on editing often.
|
2. GIF: Uses a fixed list of colors (indexed). Useful for transparency and animation because most photos have many more colors than the 256 that GIF represents.
|
3. PNG: Can be used for full color or indexed images. Will be much larger that JPEG, though supports editing without “lossing.” It supports transparency but not animation.
|
4. XCF: Format of GIMP’s. Large files that can only be read by GIMP. Can be compressed.
|
5. TIFF: Full color-non lossy format. Many web browser cannot support it. May not be read correctly in different programs. Does handle a wider range of colors, 16 bits per channel.
|
6. Raw: A term used to described the proprietary formats used by camera manufacturers.
|
7. BMP: Microsoft Windows. Recommended to use only if writing Window’s software.
|
8. PSD: Adobe. Saves layers and other information that XCF does. GIMP reads older versions, not newer.
|
9. ICO: Microsoft Windows Icon format. Contains several resolutions in one file. “ Favicon” for bookmarking websites.
|
10. PDF : Vector not pixel graphics. Vector: Collection of points, lines, curves. GIMP may be able to edit vector projects with plug-ins.
|
PART 2: GIMP PROJECT:
Be sure to save these images in your GIMP folder before inserting them in this document.
|
|
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:
|
· Levels: Levels allow you to allow you to control contrasting more precisely. This is a graph that shows you brightness and the number of pixels that have that brightness.
|
· Curves: This allows you to control light and dark areas of the image.
|
· Threshold: This allows for mapping in black and white.
|
· Desaturation: Removes color, changes the image to grayscale.
|
6. When you have applied these techniques to the Red Rock Canyon image, apply THRESHOLD to the image, save it, then insert it here:
|
1. With the Canyonlands image, use Rotation to adjust the image as indicated on pages 51-55. Save the rotated and insert here:
|
1. With the Kestral image, use the Sharpening techniques indicated on pages 55-59. Save the sharpened image and insert here:
|
1. With the little boy, Ethan, image, correct the Red-Eye as indicated on pages 61-66. Save the corrected image and insert here:
|
No comments:
Post a Comment