In these articles we will discuss a series of node rigs you can freely download. These sets allow you to have fast previews of many settings for color correction. You can compare the results and get inspired by results never imagined.

The first one concerns the balance of brightness.
the “brightness and contrast” node allows you to lower or increase the amount of light in your image. Often, however, the picture has too bright shadows while the light areas are too dark. In cases like this (and like many others) is necessary to use the curves.
The first thing we do is decide the depth of black and white. In Gimp or Photoshop this is done in the “levels” panel,  you can move the triangles that represent the black and white

in blender to do this you need to move the start and end points of the curve

considering 1 as the darkest setting (for both the shadows or light) and 7 as the brightest, we will have a number of possibilities. the rig node we are talking about this time makes a grid where these possibilities are placed side by side to compare and decide the most appropriate combination. The usage is very simple, just put your image in the input node, press F12 and you’ll get an image like this

just write down the name of the node that you like and append it in your original file. Keep in mind that with the extreme settings the results are acceptable only if the input is a HDR image or a raw data rendering .

In addition to nodes “Brightness and Contrast” and “RGBcurve” there are other methods to increase or decrease the brightness, contrast or saturation. Of these alternative methods I will speak in the next post.Meanwhile, download this file and test. stay tuned

attention

In recent versions of blender have been some changes that have made it almost unusable this file.

It works well up to version 2.61 (download here).
Soon will upload the version will working  with the latest release.

http://www.luceri.it/wp-content/plugins/downloads-manager/img/icons/default.gif download: Light Balance.zip (128.53KB)
added: 22/11/2010
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A complete and extended version of these articles will be published

in the next BLENDER ITALIAN MAGAZINE