Digital Image Basics

*please search the licensed image collections before attempting to scan a book for classroom use*

Using Images in Presentations:

Your digital image should be at least as large as the space you want it to occupy. The default size for a PowerPoint slide is 1024 x 768 pixels (but you can work with larger image sizes than this).
Many images you find online will not be this size – the web favors much smaller sized images. Make sure if you are searching the web for an image to use, you check to see that the size of the image is large enough. *and only do this after you have searched the university image collections*
You also don’t want to use a huge file (like a TIFF) because this will make the Powerpoint file too big. Keep in mind the quality of image you want and the number of images in your presentation in picking image sizes.
Resolution can be confusing. The goal is to have the ppi fit the layout of the projection. Since you can’t always know what that is, assume the standard 1024 x 768.
Resizing can be done to these specifications in most image viewers as well as Photoshop and GIMP.
Basic digital image best practices
  • Keep a copy of the largest version of an image (maybe a 1-5MB image which is at least 1000 to around 3000 pixels on the longest side, if possible) as an ‘original’ from which you can make smaller derivatives.
  • Get comfortable with image editing software and always keep the master image unedited.
  • Start naming image files in a convention that makes sense to you and organize them into folders. Or, use an image management tool like Tropy or embedded metadata.