Infrared Camera Conversion, My Journey – Part 2

I was able to resolve the issue preventing me from creating Raw files. The Fuji XT series has the menu option “Image Quality” and that is where you tell the camera to produce Raw files. I’ve been shooting with Fuji since 2014 and am well aware of that required step. I checked that menu item 3 times over a period of several days and the menu item wasn’t there. The 4th time I checked it, the option was there. I assume it was the pesky squirrels that raid our bird food.

Selecting the proper white balance can impact the output of post processing significantly. My experience with my Fuji XT-3 follows. The first thing I noticed was that, in my camera, the Temperature and Tint settings on the Raw file were shifted far to the left; so far, in fact, that I had little room to adjust. The JPEG file had those settings pegged at zero. I have seen suggestions to set-up a specific color profile in the camera. In my experiments with a custom white balance color profile, the setting modifies JPEG files properly. However, it does not modify the Raw files even though it appears to when you look at the pictures in playback mode. That seemed a bit strange to me because I sometimes choose the daylight or cloudy day preset when I shoot in the visible light range. Oddly enough, when I chose the Kelvin, “K”, preset and adjusted the temperature manually, the change was reflected in the Raw file. After experimenting with different setting, I decided that I would just keep the white balance on auto.

I also discovered that the best white balance setting is obtained, in Lightroom and Photoshop, by using the Eyedropper Tool and selecting a spot on the image that I know is white. If I don’t have a white spot to select, I choose something close and adjust by dead reckoning.

When using color infrared, there is a step that needs to be added in post processing to get those beautiful false color infrared images. The step is called color swapping. It is important to do the white balance adjustment before you color swap. I did the color swap in Adobe Photoshop. After opening in photoshop, you choose Layer>Adjustment>Color Mixer which opens a box that lets you change the amount of red, green and blue in each of the red, green and blue color channels.

The simplest is a red/blue swap. In the Red Channel, set red to 0 and blue to 100 while in the blue channel, set red to 100 and blue to 0. There are other tutorials that suggest other formulas for color swapping. I have done some experimenting but have found the simple swap to work well. Once you’ve swapped colors, you can make other adjustments to tweak the image to your own liking.

Thanks for sharing my journey, to this point. If you are considering an infrared conversion, I hope you can learn from my early mistakes as I attempted to climb the learning curve. Now, it’s time for me to start getting some interesting images and honing my skill.

Raw Image, Camera White Balance Set to Auto
Raw Image with White Balance Adjustment from Crape Myrtle Flowers
Image After Simple Red and Blue Color Swap
Image After Color Swap that included Swapping Green Channel

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