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Difference between revisions of "LDR / HDR - Workflow case E"

(Rendering of a single bracket stack)
(Rendering of the whole panorama)
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Do not forget to choose the HDR Radiance output format (.hdr).
Do not forget to choose the HDR Radiance output format (.hdr).
=== Rendering of the whole panorama ===
In the case of bracket stitching, the color correction unbalances between layers can disturb the HDR Anti-ghost. <br/>
Modify the Render settings of the '''HDR output'' preset' by checking the '''Diamond weighting''' instead of '''Remove HDR ghosts'''. <br/>
Do not forget to choose the HDR Radiance output format (.hdr).
| [[Image:Autopano250 HDR-casE-Render.jpg|left|thumb|500px]]
| [[Image:Autopano260 HDR-casE-Render.jpg|left|thumb|500px]]
| [[Image:Autopano250 HDR-casE-result.jpg|left|thumb|500px|Final render]]
| [[Image:Autopano260 HDR-casE-result.jpg|left|thumb|500px|Final render]]
| [[Image:Autopano250 HDR-casE-ToneMapping.jpg|left|thumb|415px|After Tonemapping]]
| [[Image:Autopano260 HDR-casE-ToneMapping.jpg|left|thumb|415px|After Tonemapping]]

Revision as of 10:46, 15 December 2011

From LDR input with bracketing to HDR output

Example 1

Source images

In this example, 9 bracket levels have been made ​​during the shooting.

Autopano250 HDR-casE intro.jpg


When analyzing the source folder, Autopano discovers bracket stacks automatically.
Howvever, Autopano doesn't automatically group images by stack (depending on how the bracket function is implemented on your camera).
In this case, you must select the images in the group and use the contextual option "Create stack by N".

Autopano250 HDR-casE-stacks1.jpg

By default the reference image is the first image of the stack. In this example, the first image is too dark to find enough control points.
It requires to modify the index of the reference image via the "Create stack by N" option of the contextual menu:

Autopano250 HDR-casE-stacks2.jpg

The detection of the links can be computed by 2 different ways: through all bracket levels or level by level.
The shooting used here was performed with a tripod, each level bracket is identical to the previous (the 9 brackets of the same image are perfectly superimposed).

Autopano can then simply find links on the only reference level and to establish "hard links" (precisely superimposes an image stack without assigning control points).
In the Group settings, Detection tab, select the detection as follows, One stack level and Use hard links for a stack:

Autopano250 HDR-casE-links1.jpg

As the aim is to get a .hdr file in output, each bracket level must be balanced compared to the others.
Each image will provide consistent information with the others (similar radiance level not dependent on the shooting exposure).
In the Group settings, Panorama tab, uncheck the color correction by layer and select the type of correction: Exposure (best suited mode to bring all the images into the same HDR space).

Autopano250 HDR-casE-GroupColorFix.jpg

Launch the detection, then edit the detected panorama.
Activation of the color correction in HDR mode can be done via the following menu:

Autopano250 HDR-casE-HDRColorFix1 en.jpg

The presence of many exposure levels allow to be more restrictive on the exposure's weight.
The curve of the Fusion tool allow to give more or less weight to pixels depending on their exposure.
Here, we will remove the over-exposed and under-exposed pixels (enable the fusion and remove the darkest and lightest parts):

Enabling the Exposure Fusion

In the HDR format, the dynamic is not limited, there is no need to reframe this dynamic.
Click on the Color anchors icon to disable the automatic levels histogram before to launch the color optimization.

Autopano250 HDR-casE-HDRColorFix2.jpg


Modify the Render settings to select the HDR output preset.
Do not forget to choose the HDR Radiance output format (.hdr).

Autopano260 HDR-casE-Render.jpg
Final render
After Tonemapping

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