Adjust the color of panoramic images in REGISTER 360 and GIMP

Preview:

  • Edit HDR colors of panoramas

  • Export panoramic images to jpg

  • Correct images, add additional info, change colors

  • Import panoramic images and recolor point cloud

  • Export recolored point cloud in LGS

  • Segment clouds by the color

In the tutorial, I would like to share with you a few tips and tricks on how to improve your panoramic image quality from the laser scanner and how to use these images in unusual ways.


So first of all you need to know, that you could implement different filters and correct contrast, saturation, gamma, brightness, etc. directly in the Cyclone REGISTER 360 or Cyclone CORE. But you should notice that this tool works only with HDR images, thanks to RTC 360 all images are HDR

For editing colors click the right mouse button on the setup in the tree view and choose:

  • Edit HDR Image - REGISTER 360

  • Tone Map Pano Image - Cyclone CORE

REGISTER 360 - Edit HDR Image
Cyclone CORE - Tone Map Pano Image

In the appeared window, you could select different pre-setup filters, they are representing different tone mapping algorithms.


The second thing you need to do is to choose one of the filters you liked, then pull down the menu with selectable parameters (contrast, saturation, gamma, brightness, etc) and adjust each of them one by one. After all, the corrections will be done you could choose how way to apply these adjustments: just for the current image or for the entire project and click the Ok. Also, there is the Pick Gray tool that allows easily adjusting tones based on the selected grey color. To use this tool click the Pick Gray button and then double-click on the grey color on the image (for example let's click on the road). To see the changes move the parameter slider a little bit to any side. And you will see how Cyclone has improved your color tones.


REGISTER 360 - Tone Map Editor

When adjusting the panoramas, we also changed the point clouds, which means that we were able to get more suitable point clouds for our tasks, better orthoimages, and color triangulation models.

Orthoimage - before and after filters

Alright, now the image looks much better, but what if:

1. you don’t have HDR information in your image

2. you'll need more tools to highlight all details in the image

3. you would like to add some additional information on it.


For that cases, you could export your image into an external raster graphics editor used for image manipulation (retouching) and image editing. I’ll be using GIMP software for that, cause it is free and open-source. But you could use photoshop or any other you liked. Ok, let’s export our panoramic image with the right mouse button, click on the current station and choose the Export Panoramic Images, and then export jpg. Also, you could select any number of stations and do all the same things for them at one time. Choose the destination folder and you’ll get your panoramic images in jpg format.

REGISTER 360 - Export Panoramic Images
Cyclone CORE - Batch Export Pano Images

Note! For export panoramic images you should have the Cyclone PUBLISHER PRO license.

Run the GIMP software and just drag and drop your image there. In the software, you’ll be able to do a lot of different stuff like adjusting colors, and tones, blending images, highlighting features, and details, adding additional information, and deleting redundant elements.


For instance, let’s correct colors and add navigation symbols and some text. When all corrections are done, save the current image in the same format as it was before (jpg).

GIMP software

In REGISTER 360 right-click on the setup or bundle, choose the Re-Import Panoramic Images tool and select the folder that contains the panoramic images.

In Cyclone CORE it’s called Import Panoramic Images

REGISTER 360 - Re-Import Panoramic Images
Cyclone CORE - Batch Re-Import Pano Images

The naming must match the export name and the aspect ratio must be the same for successful re-import. Now you got adjusted panoramas with additional information, but don’t forget that the point cloud changes its colors based on these panoramas, therefore you could see unwanted effects in the point cloud, that’s why I recommend you add additional elements only in space without point clouds (like the sky, windows or dead space under the scanner).


For Cyclone CORE the point clouds don't recolor by themself after you add a new panoramic image. To recolor them, you need to select the ScanWorld in the Navigator window and choose Batch Apply Multiimages with the right mouse button. If your ScanWorld includes more than one panoramic Multiimage, then you should select the exact image and click the same button (Batch Apply Multiimage)

Once we know that we can color the point clouds any color we want, we can use this feature for additional scenarios. Let's imagine that we have colored all the elements in the panoramas in the color corresponding to the element layer. This is a kind of manual classification. After importing these images into REGISTER 360, we ended up with a hand-colored point cloud. Now we can segment it by color in Cyclone 3DR with one click. Using a segmented point cloud greatly speeds up and simplifies your entire project digitizing process.

Cyclone 3DR - Segmentation by Real Color

If you still have a question or you want to repeat this tutorial by yourself, but don't have a valid license then you could reach me by clicking the below button.