Infrablue white balance
White balance can be critical to getting good results with infrablue converted cameras. Many Canon Powershots allow custom white balance. This option is sometimes available only when the camera is in Program Mode, not an auto mode or auto preset.
To custom white balance an infrablue Powershot:
- Press "Func Set" (Function Set).
- Scroll to the white balance icon.
- Scroll to the custom white balance icon.
- A message will display indicating which button to press to set a custom white balance.
- Point the camera at a surface of a color that you want the camera to think is light gray, and fill the frame with that color. A medium rich blue (between sky blue and navy blue) seems to work well with many of the common infrablue filters that have been tested (see below). For CMOS cameras, some evidence suggests that the white balance surface should be in the shade. For CCD cameras some evidence suggests the results are better when the surface is in direct sunlight.
- Press the designated button.
- Press Func Set to return to camera mode.
When white balance is done properly, infrablue photos of healthy plants (in sun or shade) appear orangey yellow. When white balance is not done properly, infrablue photos of plants appear gray.
More testing is needed to determine the best white balance process for different combinations of cameras and filters. Not all blue surfaces will reflect the same proportion of visible and infrared light, so some colors will work better than others. Add your observations here or at the infrared forum: https://groups.google.com/forum/#!forum/plots-infrared