What file format and size will work best for what I’m trying to do?
JPG images downloaded from Reed Digital Collections (CONTENTdm), ARTstor, and Oxford Art Online should be sufficient for basic PowerPoint or Keynote presentations, web pages, or Word documents. If you are interested in acquiring a high resolution TIFF, please contact email@example.com or visit the Visual Resources Collection (VRC) in Library 42.
JPG is a smaller, highly compressed file with some loss of image quality when files are re-saved. JPGs are often generated from a master TIFF. Compression usually saves the file at 500 KB to 1 MB.Suitable for: Email, web pages, or inserting into another document such as Microsoft Word and PowerPoint or Keynote presentations.
TIFF is the industry standard for master digital image files. It’s a high-quality, large-sized file that can be compressed when saving. There is no loss of image data when file is opened and closed (re-saved). Normally, files should be saved no less than 1 MB - for small images & quick scans - and no more than 15 MB - for large images and high-resolution scans.Suitable for: Master file to edit in Photoshop or other image editing software, archival file, or high-resolution printing.
How should I size an image to fit onto a PowerPoint slide?
Saving digital images at the optimal size keeps PowerPoint documents a reasonable size and allows them to load faster. The optimal image size (in pixels) should be equal to the output computer screen or projector. For example, if your screen resolution is set to 1024 × 768 pixels, you should save the image at 1024 x 768 pixels to create an image to fill a slide. 1024 × 768 is a very common resolution for displays and projectors, so it's a good default if you’re unsure of the output resolution.
To save the image to the optimal size via Photoshop, go to: Image >> Image Size >> Change pixel dimensions to match the output resolution. Only size images down, not up. If the image is smaller than your target output, either re-scan it at a higher level or find another source. To capture fine detail in an image, save it slightly larger than the output resolution.