RawTherapee is a free, cross-platform raw image processing program, released under the GNU General Public License.
Parrot Bebop 2 is a gps-enabled quadcopter/drone that has the ability to take hires pictures in the DNG (RAW) format.
RAW Photo images are images dumped directly from a camera’s sensor. No correction or profiling is applied. The Bebop 2’s camera is a fisheye angled lens. It is designed this way primarily because it uses digital stabilization and cropping as a means to create a type of “digital gimbal” for it’s video recording/panning features, etc.
Normally to do lens correction on a raw image from the Bebop 2 you would open the DNG file in Adobe Photoshop or Adobe Lightroom then use the lens profile (aka LCP) from Adobe/Parrot to apply distortion correction – or alternatively/manually use Lens Correction / Adaptive Wide Angle to achieve desired results. Not everyone has, or can afford, these applications. Luckily, the world is full of amazing programmers to fill these types of voids. One such program is the mentioned RawTherapee.
You can use Photoshop LCP profiles in RawTherapee and attempt to auto-apply lens distortion correction, etc. using the Parrot profile, but I’ve noticed using the LCP from Adobe in RawTherapee leaves much to be desired. If you’re interested in adding the Bebop 2 LCP profile to RawTherapee, check out the instructions in link below on how to obtain the profiles by installing Adobe’s free DNG Converter.
However, I have gone through many lens corrections profiles and settings in order to find the results I find the best. Below is a screenshot of RawTherapee showing the before/after results of one of my profiles. Also linked are 2 downloads to my RawTherapee profile settings. One for full image and one with 16:9 cropping. To apply a saved profile you click on the Open button on the top right under the “Processing Profiles” section, top right (highlighted in picture), then browse to the directory where you saved them and select one.
The screenshot also highlights how to open & save files. Open: click on File Browser tab on left. Save: Click the down arrow icon below image.
I’m not very experienced with this software so if you have further questions you would be best to Google for the answers. It has a good community and lots of documentation.
Have fun. Once you get a little comfortable with the application… experiment.
Profiles (right click & Save As):
I’ve noticed that sometimes loading processing profiles on different images that the Color/temperature settings can go weird. As in, Auto WB isn’t selected. If that happens to you (image opens all purple or green, etc.) then go to the Color tab and reset the values then tweak Temp to match your desires. Or more accurately you could select Method, scroll up, and select Auto WB to reset everything. Also shown below: