How Pixels, DPI, Resolution, Picture Size, and File Size All Relate

❎ Photographic image size can be complicated. I'll review how a digital picture is constructed, file size, and what you need to keep in mind when sharing or publishing.

One measure of size is an image’s resolution, which measures pixels (or dots) horizontally and vertically; 1920 × 1200 pixels, for example. Another measure of size is the amount of space in bytes required to store the file of the image on disk. The relationship between the two is affected by both lossy and lossless compression algorithms used when saving the image. Sharing a file that is too big in terms of file size can result in long or slow page displays and downloads, or email being rejected for being too large. When you share an image that is too big in terms of resolution, it can be awkward for the recipient to view. You can make images smaller by resizing, cropping, and/or adjusting compression settings.

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Chapters
0:00 Resizing photos
0:25 Size and size
0:57 What is size
1:15 About pixels
1:44 Resolution
2:22 Size versus size
3:16 File size
4:34 Compression
5:02 Lossy
5:11 Lossless
7:24 DPI
20:03 Save your originals


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