I purchased some (royalty-free) photos to use for a friend's website.

This is the first time I've used photos that are not my own, and so have not dealt with crediting others' copyright.

Here is my question:

Am I *required* to credit the photographer and Dreamstime, or is it a courtesy?

I suppose I could add a section somewhere on the website that just lists all of the photographs and their respective photographers.

How have others handled this?

Thank you~

I have found photos that I want to purchase based on their composition.

My friend prefers black & white. I'm finding few b & w that will fit her needs, and we need more photos.

I know I can take color photos and grayscale them, but it's not really the same.

Any advice so that I don't completely mess up great quality photos? This is for website work, and the photos will be fairly small (~500 pixels wide and smaller), so the resolution won't need to be perfect.

I have Photoshop, and a few other image editors.

Thanks!