Photos and Photography Section
Culture and Entertainment
Services (only Italian)
Free HDR on line
Pagine di gestione
HDR on line through the fusion of two or three differently exposed pictures
This page allows create HDR images by merging two or three photos exposed in a different way, in order to obtain a final more realistic image than the initial ones. Although it is not HDR in the strict sense, the resulting picture is an HDR image in a broad sense (HDR is the the acronym for High Dynamic Range), since it equivalentas to what you would get from a sensor with a greater dynamic range, with a better signal to noise ration in the darker parts and which doesn't saturate in the brighter part. The tecnique used here is, to be more precise,
, described in comparison to proper HDR on the pages
Exposure Fusion: What is it? How does it Compare to HDR? How Do I Do It?
HDR Tone Mapping vs. Exposure Fusion (What’s the Difference and Does it Matter?)
For a description of the approach to the problem used here and for the instructions for this page look on the pages
Instructions for using the page for the creation of HDR images on line
Instructions for using the tool for analysing the rotation and correcting it
HDR images on line: gradient comparison
The default values are the ones which proved to be the best in most cases!
The pictures you can find in the section
What to see in Milan: Less known treasures of art and history
have almost all obtained from two starting pictures fused using the algorythm contained in this page.
: If you want to let the system calculate the shift using a customized rectangle, click once on the high lights picture to begin it and click twice to close it!
: If you use too large pictures (like > 12Mp) it can cause an error!
Fusion of 2 pictures
Fusion of 3 pictures
Choose the High Lights
Choose Low Lights
Larger side length of the preview
Choose the underexposed picture!
Choose the correctly exposed picture!
Choose the overexposed picture!
Long side preview images
Gradient type for edge detection
Adjust relative position!
Use inserted values as starting point!
Use inserted values!
High Lights Picture
Angle peak treshold:
Rotate of °
Low Lights Picture
Rotate of °