different sizes of graphic file formats vary in their file size, GIF or PNG format is appropriate for images with sharp transitions and few colors, JPEG is better for images with lots of colors and smooth transitions, such as photographs WMF files can be edited in ppt.size of projector image at most 1920 x 1200 = 2.3 mega pixels.typical print resolution is 200dpi (dots per inch), screen/projector resolution 96 dpi.make sure that images are not being stored at a resolution higher than the screen (or print) resolution.go to the journal site to download images at original resolution, or sample images from pdf files (example).take up lots of space on your computer and backup.Google Drive (15GB free, unlimited with a LionMail account, however, there are issues).another option is to use on-line backup services, your files are then stored on an off-site server, e.g.:.more and more manufacturers offer software/drives with encryption software included.your external drive might also come with synchronization software.for PCs try: SyncBack Freeware SyncBackFree V6.5.4.0 (see bottom of page or use direct download page).use synchronization software to replace only the files that were changed on your computer hard drive or your external USB drive.external USB hard drives, 1000GB for
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