Une petite astuce trouvée sur un forum américain pour ceux qui utilise PtGui :

I have used this method before and if all your images were shot in the exact same place, it works quite nicely for generating multiple equirectanglar from the same PTGui file. It sound like a lot of work, but it work greats.

It will require that you create a folder for each set of images. One folder for normal exposure, one folder for under exposures and one folder for the over exposures, etc….
Place each set of images in its respective folders. Now, you will need to rename each of the images in each folder. Use the image names from the normal exposure folder.
What you want end up with is multiple sets of files with the same name.
For example if the folder containing the normal exposed images are named 0001.jpg. 0002.jpg, 0003.jpg, 0004.jpg, 00005.jpg, 0006.jpg., you will want each image in then other folder to have to same name as the images in the normal folder.
Now create a new folder, give it any name you like. Copy all the images form the normal exposure file and past them into the folder you just made, you will be working from this folder.
1. In PTGui create your normal exposure equirectanglar image from the images in the folder you just created. Save the PTGui file into your working folder.
2. Close PTGui
3. Copy and paste the images from one of the other exposure folders into your working folder. This will overwrite the file in the working folder.
4. Start PTGui, open the saved PTGui file. This will load your images. Make no adjustment to any control points.
5. Create your next equirectanglar image ( be sure to change the file name of the equirectanglar image be for you start to stitch.
6. Repeat steps 3.4 and 5 until you created how ever many equirectanglar images you need.
If all your bracketed images were shot in perfect alignment each one on the equirectanglar image you just created should line up perfectly.

I hope this helps.
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Mark Houston
360Michigan
360Michigan...a VR Journal