Quote Originally Posted by jrw View Post
If the sky and the landscape are mostly on different RGB channels, it is possible to go to the RGB tab in DPP to allow tweaking the histogram for the separate colour channels. Will caution that small adjustments are preferred as it is very easy to create a mess this way as most objects do have all three colours in them. If the goal is to darken the sky or brighten the landscape to reduce the brightness contrast I'd strongly recommend picking up some rectangular graduated ND filters to allow capturing the desired image in the camera with a reduced dynamic range and better colour rendition.
You can adjust luminance values as well as separate RGB values when in the RGB tab. Right click and you get the options. For those who prefer to stick to freeware you can also use ZoomBrowser to adjust JPEG/TIFF images. You can adjust Levels, curves, RGB channels, brightness and unsharp mask, and get the Crop tool, resize tool, e-mail tool, etc. It is ok to use if you do not want to spend any Money on software + you get to keep camera settings and Canon colors. There`s also possible to adjust JPEG/TIFF images using the software that came With Your Canon printer. All in all, you can get far using the provided software only.