Autopano - Panorama Editor - Color Correction
- 1 Autopano Pro & Giga 4.2
- 2 Anchors
- 3 Levels
- 4 Fusion
From Autopano Pro & Giga 4.2 we added a better support of large differences in exposure which gives much better results and let you choose the global exposure tone. You will also find a better white balance stability (see Color modes section below).
Default color space is sRGB and can't be modified
This tool regoups the global color correction and color corrections of individual images functions. Enabling it displays:
| Settings of the tool, in the tools zone (Autopano 4.0.x):
|| Settings of the tool, in the tools zone (from Autopano 4.2): |
You can't fix yourself Gamma correction manually but its value is always computed and applied
- Correction anchors, on each image on the panorama editing zone:
This example illustrate the vignetting effect (with special thanks to Jérôme Pouille)
In this mode, the mechanism to equalize the brightness or color of pictures against each other is not used. In fact, in certain cases, the color correction is not needed. For example, when the picture is shot in manual mode. Warning, surprises could arise with the manual mode (automatic ISO, light conditions could change due to passing of a cloud, etc.).
This mode is active by default. The purpose of this adjustment is to align the small differences in brightness, contrast and color in the series of pictures that make up the panorama.
For the most part, this is the correction that you will use.
From version 4.2, a new Exposure compensation menu will let you display overexposure (in red) & underexposure areas (in blue-not shown in the example) and choose the global exposure tone by using the slider.
This icon is only available if your images contain Exif data for the aperture and shutter speed.
This mode is used when a subject requires a large margin of exposure. The algorithm is different from the LDR mode and allows for the harmonization of panoramas when the differences in brightness are much larger. This method of correction directly calculates the luminance for each pixel; Autopano no longer works with the pixel values, but works with the real values of the scene. In practice, you will not see the difference on a scene with low dynamics but everything changes when the exposure differences are very large.
When passing to the HDR mode, the produced image often has a very large dynamic and we need to reduce this dynamic to have something that is displayable.
The levels are available in the HDR mode and they let you make certain global changes on the panorama in order to reduce this dynamic.
Use this mode is you want to make a post-production of the rendered file in a dedicated third-party software. HDR mode in Autopano is basic.
Color correction anchors
The correction anchors are used for seamless image stitching (colour, exposure, contrast, etc.).
An anchor represents how the corresponding image will be changed by the color correction algorithm.
Type of anchors
- Reference image: It is the reference for the correction of other images. The anchors of the other images will therefore be influenced by the contrast, exposure and tone of this anchor.
A right click on the image opens the contextual menu:
- Do a right click on one image (on the number) let you put a single anchor on it. Right click somewhere on the panorama put anchors on each image. You can also use rubber band selector to select multiple images. Click on the panorama then select images by moving the cursor over the images.
Optimize by layers
If your panorama has layers (brackets, etc.), the changes will be applied to all the layers of the panorama.
Color level after update
The Level histograms will be adjusted according to changes
Optimize on any anchor change
By default, this option is enabled to view the results after each change.
If the "Optimize on any anchor change" option is unchecked, clicking on this button will let you confirm the changes so that the result can be seen.
This window lets us adjust and change the entries and exits in terms of light intensity.
The window lets you set the applicable automatic correction mode via the Auto button.
Closely related to the use of a bracketed shooting, with this tool you can obtain a perfectly exposed panorama when mixing different exposures (also familiarly called HDR).
There is no real rule about the use and configuration of the Exposure fusion tool (based on images, the desired result, etc.), except that it can only be used with bracketed images.
This part of the documentation only describes the technical aspects of this tool.
For more information, see the page dedicated to its use: Use the exposure fusion
The tool is divided in 2 parts:
- The Exposure weights part allows to set the global exposure, and pixels weighting on both dark and light tones.
- The Blend settings part allows to view the fusion result depending on the setting defined, that lets check the settings to apply or not when rendering.
Note : Enabling this tool combines the activation of the Preview tool, allowing to view the final result before to process to the final rendering.