Everything you need to know about saving, creating, scanning, or sharing image files.

What is the difference between bitmap and vector images?
Bitmap (or raster) images are stored as a series of tiny dots called pixels. Each pixel is actually a very small square that is assigned a color, and then arranged in a pattern to form the image. When you zoom in on a bitmap image you can see the individual pixels that make...
What is resolution?
Resolution refers to the number of pixels or individual color dots in an image. A high resolution image has more dots, which allows it to display more detail. Your display has a resolution, which is usually described as the number of columns (width) by the number of rows (height). Most displays sold...
What is bit depth?
Bit depth refers to the color information stored in an image. The higher the bit depth of an image, the more colors it can store. The simplest image, a 1 bit image, can only show two colors, black and white. That is because the 1 bit can only store one of two values,...
How do I get images on my computer?
There are many different ways to obtain images you can use in your projects. Digital camera: one of the easiest ways to get pictures of your students is to take snapshots using a digital camera. You can then connect the camera directly to your computer using a USB cable, or you can...
What resolution should I use when I scan my images?
The resolution you should use depends on how you plan to use the images you are scanning. If you plan to post your images on the web a resolution of 72 dpi should suffice because this is the common resolution for monitors. If you plan to use your image in a print document...
How many megapixels do I need my camera to have?
Most digital cameras sold today support a resolution of 5 megapixels (million pixels) or higher. A 5 megapixel camera will allow you to print a 5 X 7 or 8 X 10 image of good quality. If you want to print larger photos, you will need a camera with 6 megapixels or higher....
What is the difference between optical and digital zoom?
Most digital camera vendors advertise the combined (digital and optical) zoom of a particular model, often touting a maximum zoom of 10-12 X. This is a marketing gimmick that is used to make their models sound more impressive. In reality, you should really worry about the optical zoom capabilities of your camera, which...
What are some tips for taking better pictures?
Below are some easy to apply tips for improving the quality of your pictures: Fill the frame: Zoom in or move in close so that your subject fills most of the frame in your viewfinder. This will result in an image that not only feels more intimate but also has fewer distractions...
What are the differences between the file formats used to save images?
Most image formats use some type of compression to make the files smaller in size. Many scanners are set to save the scanned images using the TIFF format by default. Even though the TIFF format supports compression, TIFF files still tend to be quite large. However, most image editing programs will let you...
How do I reduce the file size of an image?
The primary way to reduce the file size of an image is by increasing the amount of compression. In most image editing applications this is done by changing your settings in the Save As dialog box after you select a compressed format such as GIF or JPEG. Adobe Photoshop uses a separate Save...
What is iPhoto?
iPhoto is the photo management application included with the iLife suite installed on all new Macs. In addition to letting you import, organize and share your pictures, iPhoto includes a number of editing features that will allow you to enhance your pictures and fix minor problems. A great feature of...
What are the main parts of the iPhoto interface?
The iPhoto interface consists of four main areas: the Source list, the Info/Keywords/Calendar area, the Viewing area, and the Toolbar. The Source List displays any albums, slideshows, or books you've created. Your iPhoto Library will be listed at the top of the Source List. The Library contains all the photos you have imported...
How do I import photos from my digital camera using iPhoto?
Before you can work with your photos in iPhoto, you must first import them as follows: Connect your digital camera to your Mac using a USB cable. Turn the camera on and set it to the correct mode for playback (this will vary by model). iPhoto will automatically open...
How do I use iPhoto to manage my photo collection?
iPhoto allows you to create albums that can be used to organize pictures by categories. To create a new album: Choose File, New Album (or click on the Add (+) button near the bottom left corner of the iPhoto window)....
How do I crop and rotate images using iPhoto?
To begin cropping an image in iPhoto, click with your pointer on an area of the image then drag to enclose the area you wish to keep and click on the Crop button or press Return on your keyboard. You can also choose preset image dimensions from the Constrain pulldown...
How do I straighten photos with iPhoto?
If any of your photos are crooked, you can use iPhoto to straighten. To straighten a photo in iPhoto, double-click on it in the Viewing area to open it in edit mode. Next, click on the Adjust button to open up the Adjust pane. You can then use the Straighten slider to gradually...
How do I remove red eye from my images using iPhoto?
Red eye is caused when the light from the flash is reflected off your subject's eyes. This can often ruin many pictures taken in poorly lit indoor spaces. Fixing red eye with iPhoto is simple: Click on the Red Eye button, then click on each eye using the crosshair pointer....
How do I fix the colors in my images using iPhoto?
You will find two ways to fix colors in iPhoto. The first way is by using the automatic color correction feature of iPhoto by clicking on the Enhance button (the one that looks like a magic wand). iPhoto will then automatically adjust the exposure and attempt to fix the colors...
How do I turn a color photo into a black and white photo with iPhoto?
Changing a color photo into a black and white photo (or giving it a sepia tone) is as easy as clicking on a button in iPhoto. Select the photo you want to convert, then click on the Edit button in the toolbar. This will open up the photo in edit mode. To convert...
How do I create a slideshow using iPhoto?
There are several ways to create a slideshow in iPhoto: You can select an album from the Source list and click on the Slideshow button on the toolbar, or You can select individual pictures in an album and click on the Slideshow button to create a slideshow with only...
What are Books, and how do I use them in iPhoto?
With iPhoto, you can also create your own beautifully designed photo books to print yourself, or you can have them professionally bound and shipped directly to you. In your photo book, you can add your own text and choose from a variety of professionally designed themes. To create a new book in...
How do I build a web gallery using iPhoto?
A web gallery consists of a web page that displays thumbnails of the pictures you select to export in iPhoto. The webpage also allows the person viewing the gallery to click on a thumbnail to open a larger version of the picture. iPhoto integrates well with iWeb, the new web design program...
How do I email pictures using iPhoto?
iPhoto gives you many ways of sharing your pictures with friends and relatives. One of the most popular ways is by emailing them as attachments using the Mail program that comes installed with OS X. To email pictures as attachments in iPhoto: Select the pictures you want to send....
How do I share photos over a network with iPhoto?
All you have to do to share your files with other computers on your network is enable this feature in your iPhoto preferences. In the Sharing tab of your iPhoto preferences, you can choose to share your entire Library or only individual albums. You can also assign a password to the shared albums....
How do I print my pictures using iPhoto?
Printing your pictures with iPhoto is easy. Select the album, roll, or individual image you want to use, then select File, Print. In the print dialog box, you can see a preview of your printed image or images in the small window on the left. Select a printer from the...
How do I order prints using iPhoto?
You can use iPhoto to order professional-quality prints of your photos. The Order Prints service in iPhoto makes it easy to choose a print size and quantity for each of your photos and specify a delivery address. You will need to have an internet connection before you can use the Order Prints service...
How do I back up my photos in iPhoto?
iPhoto allows you to back up your photos by copying them ("burning") to a CD or DVD, depending on what kind of drive you have on your computer. To copy images to a CD or DVD, first make sure you have some blank media in the drive, and that the media matches the...
What is Flickr?
Flickr is a website that allows you store, sort, search, and share your photos online. The free version of Flickr allows you to upload up to 20MB of photos each month (a paid version with a 2GB limit is available for $24.95/year). In addition to being a place to host your images,...
How do I use Flickr to create online presentations?
Flickr is an online photo hosting program that can also be used to host presentations online if you export your Powerpoint or Keynote slides as images. To save your slides as images in Powerpoint: Select File > Save As....
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