I see what you mean. Those were taken with a Canon G2 as RAW, iirc, and converted to TIFF via software supplied with the camera. TIFFs were converted to JPEG with only highlight and shadow adjustments.
It was a lovely day along Big Sur and the colors in the photograph are actually pretty close to real!
If you get the chance, try driving along the western foothills of the Sierra Nevadas in April or May from King's Canyon to about 30 miles south. You will find extraordinary colors along the foothills as grasses and flowers of all varieties begin to resurface. In the mid-morning light when the shadows aren't too strong, it's a photographer's paradise.