Is it different from using the local contrast module or the equalizer ?

*Aurélien PIERRE*
aurelienpierre.com <http://aurelienpierre.com>


Jason Polak:
> As a user of darktable who also follows the dev list, this looks 
> really good. Yesterday I found a shot that I thought could use a 
> little of this module. Another option with it also may be to use a 
> parametric mask to only target the brighter areas of the image,
> which is often where the haze occurs.
> 
> In any case, I hope to try this module.
> 
> Jason
> 
> On 2017-02-21 08:02 AM, Heiko Bauke wrote:
>> haze removal means basically to remove the diffuse background
>> light that is reflected by the haze in the into the direction of
>> the camera.  Thus the image gets slighty darker.  This is similar
>> to when one reduces the brightness in sky regions to get a nice
>> blue sky.
>> 
>> One should be aware that the automatic haze removal module is not a
>> magic bullet.  It may even lead to undesirable artifacts, depending
>> on the input image and the chosen parameters.  The quality of the
>> final image depends of the input image of course. Garbage in,
>> garbage out. It is beneficial, when the RAW image is well-exposed.
>> Thus, the example that I have shown before might not be optimal to
>> promote the haze removal module.  Furthermore,  best results are
>> expected when the haze removal module is combined with other
>> modules.  For example, I would start to remove the haze from an
>> image using the haze removal module and then increase the clarity
>> via the equalizer and enhance the colors by the velvia module and
>> possibly further modules.
>> 
>> Nevertheless, I think the haze removal module will be a powerful 
>> and valuable tool that can help to improve hazy images and gives 
>> very good results in many cases.
>> 
>> 
>> Heiko
>> 
>> 
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