That and the difference in cameras can cause a lot of confusion!
Hope this is not too far off topic, but I took some pictures tonight of Condilla and changed only the exposure setting. In Adobe Photoshop, I only cropped and resized. But you can see the difference in how just changing the exposure setting changes the coloring. I am constantly changing the f-stop and exposure on my camera because of different lighting variances, so you can imagine how many different shades of color we can get just because we have different cameras and settings.
Exposure setting at 1/250 sec
Exposure setting at 1/320 sec
Exposure setting at 1/400 sec
Exposure setting at 1/640 sec