There are a few things you need to keep in mind when buying a stock photo library. Image quality, selection, price, format and licensing are all important issues and should be used to compare libraries before purchase.

Image quality
Does the image quality of the library match the quality level of the end product? Make sure you can view samples of the images (full-resolution samples are even better!) before you buy.

Image variety
Selection is a key feature of a good photo library. Collections can have between 10 and 1,000 photos. Quantity is not the key - be sure there is ample variety for your intended uses. Look for variety in poses, lighting, color, focus, framing, and background.

Price
At $100 to over $1,000, a stock photo library can be a large investment. Don't be afraid to shop around for a deal. You can often find off-season deals (for example, a summer collection during winter months).

Library format
Traditionally, stock photo libraries have been available only on CD-rom, but more and more, they are being offered as digital downloads (in a compressed format), or even as DVD-roms.

Theme
A stock photo library is often based on a particular theme (Halloween, parties, spring, etc.) or subject (agriculture, nature, sports, etc.), so if you are looking for a particular use, you can get an entire collection of related photos.

Licenses and Restrictions
Most stock photo libraries come as royalty free (rf), but be sure to read the fine print in the licensing agreement. If the photos feature people, make sure they are model-released.

Where to buy
Buy your photo collection from a reputable source: direct from photographers, stock photo agencies, and office supply stores. If you are unsure, contact them and ask questions.

Keeping these few items in mind will help you find a quality library of images that will be useful both now and in the future. 

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