Page to increase the dynamic range by fusing two pictures

I have now updated and improved the page of my web site which allows to fuse online two differently exposed pictures: . In particular there is now a new gradient shape, expecially useful with images containing bright low contrast parts.
In this way it is possible to get correctly exposed pictures of scenes which otherwise would result partially eighter too dark or burnt.
The page offers also the possibility to correct horizontal and vertical shifts, so to make it possible to apply the algorythm also on pictures shot with the camera handheld.
There is also a help page.
Critiques and suggestions are welcome!
Note: If the images are larger than 12 Mp each, there could be an error!

The image below (Decorations on the voult of the apse of the Chartreuse of Garegnano) was obtained using the algorythm contained in the page.



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Looks like a beautifully exposed image; I dont have anything suitable at the moment but I'm curious to try it out when I do!
Looks like a beautifully exposed image; I dont have anything suitable at the moment but I'm curious to try it out when I do!

For the first experiments I suggest you to try with pictures taken with the camera on a support, so that you don't need to take care of rotation and transalation and you can concentrate on the fusion in itself!
New important update!
Now it is possible to start also from three differently exposed pictures, not only from two like before!
All the interested ones are invited to try it!
@Djarum: I know that there are already good softwares around! Not only good, but in reality much more complete than my one!
But not many which work on line! I have looked for, and surprisingly there is not much in internet!
But you are right, I also must try the tool in Gimp!
I have just added to my page a new gradient, or, better, the possibility to let the system use for each pixel a mix of the two gradients, with the weights of them varying from pixel to pixel depending on the luminosity of the pixel itself and of the pixels surrounding it!
Furthermore there is now also a page which illustrates with some examples the different results you can achieve depending on the number of the starting images and the gradient shape chosen: HDR on line: Comparison between the gradients
Important improvement: I have just added a new not local method, to address the problem of contrast deletion in case of certain images. Instructions and an example have been added on the Help page.
I'm not sure I can use the word "mapping" for this new method!

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