Images
From NLTLWiki
Contents |
Image Basics
Digital images are files. If you are posting your images online (i.e. on your blog or on Moodle), you want to keep the size of the files small so that they don’t take a long time to load. The size of the file is determined by the size of the image and the image’s resolution.
Pixel
the smallest unit of an image on a computer or television screen
Pixel Dimensions
the number of pixels in an image expressed in terms of the image’s width and height.
300x200
600x400
1280x800 Your MacBook has a maximun display of 1280 x 800 pixels.
Resolution
pixels per inch (ppi) or the density of pixels in a square inch.
- If you have an image with a resolution of 72 pixel per inch, then the pixels are sized and spaced so that 72 of its pixels lined up alongside one another covers a distance of 1 inch.
- The average computer screen has resolution of 72 ppi. Any images that you post online (i.e. on your blog or on Moodle), should have a resolution of at least 72 ppi.
- If you are printing an image (in a publication or to frame), you need an image with at least 300 ppi.
Preview: Quickly View & Edit Your Images
Slideshow
- Open your folder of images and select all of the images (Command + A)
- Control-click on the selected images and from the Open With menu, select Preview
- Once Preview is open, select Slideshow from the View menu
Crop
- Make sure you are using the Select tool
- Draw over the area of the image you wish to keep
- From the Tools menu, select Crop
Rotate
- Rotate an Image: Choose Tools-->Rotate Left or Rotate Right
- Flip an Image: Choose Tools-->Flip Horizontal or Flip Vertical
Adjust size
- Choose Tools-->Adjust Size
- Enter new values for width & height or choose a common size from the “Fit into” pop-up menu
- To ensure that the image keeps its original proportions, select Scale proportionally
Adjust multiple images at once (batch)
- Open your new folder and select all of the images (Command + A)
- Control-click on the selected images and from the Open With menu, select Preview (all of your images will open in Preview)
- Once Preview is open, select all of the images again (Command + A)
- Choose the appropriate command from the Tools menu
iPhoto: Store, Organize, View & Create with Your Images
- Events: iPhoto automatically groups photos together by the date they were taken or in some cases, the date they were imported into your iPhoto library
- Viewing photos within events using mouse rollover
- Renaming Events
- Merging & Splitting Events
- Viewing events vs. library
- Finding Images
- by event or image titles
- by day or date range
- Viewing and Editing Images
- Fullscreen mode
- Edit button
- Crop or Straighten or Adjust Color
- Albums: Use albums to group images from different events or to order images in a specific way for a slideshow, book or calendar
- Create album
- Drag images into album
- Reorder images
- Removing Images from albums
- Removing Image from iPhoto (remember to Empty Trash)
- Slideshows
- Moving images out of iPhoto
- Drag and drop single images to your desktop
- Export an event or album
- Upload multiple images to Google Picasa Web Album to share with others
