Using other's photos for profit
Now that I have your attention, I have a question about photos on the web. Unlike so many others, I have no desire to violate any copyright laws.
I am putting together my 'database' of plant materials that I frequently use or recommend as part of my design work. Basically, I will be giving my landscape plan customers a maintenance manual that has a page for each tree, shrub and perennial in their landscape. Each plant profile will tell them how to care for their new landscape, plant by plant, and will include optional maintenance information for maximum performance.
I'm gathering the information from a number of sources on the web and elsewhere as well as my own experience and photo files. I know that many plant producers offer free photo images to utlize in promoting their plants so for the newer hybrid type plants (like Endless Summer Hydrangea for example), I can download photos from their website so I'm good there.
If I find other photos I'd like to use, I am supposed to contact the owner of said photo (if I can find them) and seek permission- correct? What if it is a random photo with no contact source? Also, do I create a bibliography at the back that lists the sources of these photos etc. or do I give credit under the photo itself? I'd like to follow proper procedures here. Any help you can provide would be great. I will profit from the maintenance manual as I am paid for my work so I'd like to make sure I am not violating anyone else's right to profit from their work.