Photo and imagery specs
Alt text
Image alt text (alternative text) is used within HTML code to describe the appearance and function of an image on a web page. Alt text is a central principle of web accessibility. Visually impaired people using screen readers read alt text to better understand the image, and it also provides context to search engines, helping them to index an image properly. When writing alt text, describe the image as specifically as possible, but keep it short — the most popular screen readers cut off alt text at around 125 characters.
File Sizes and Specs
Print images: CMYK color format, TIFF, PSD, or JPEG at 300 dpi
Web/digital images: RGB Color format, JPEG or PNG ranging from 72 dpi to 300 dpi