Professional photographers almost always post process their images. The pictures you see on their sites have been heavily processed to bring out the detail and colors in the images. Some spend hours (or even days) working on a single image. This post processing is perfectly legal and ethical for the most part, and absolutely necessary for pictures with bright highlights and dark shadows. In the latter case, a technique called HDR (High Dynamic Range) is essential. [Note that we are here talking about real HDR, not the “color-me-bright-with-candy-colors HDR” that is also a great technique and style, but does not result in a photograph that reflects the real scene as you shot it.]
HDR Expose is a 32-bit HDR Editing application for Adobe Lightroom and Apple Aperture that allows photographers to retain detail in the highlights, midtones and shadows. HDR Expose enables merging HDR images in 32-bits and also provides a
complete suite of color editing tools, allowing photographers to fully process
HDR images in a native 32-bit workflow without having to down sample the
image to 8 or 16-bits first.