This article is not directly related to the webdesign under Joomla! but it concerns every graphic designer interested in photography.

And specifically the video noise and the chromatic aberrations rendering on a great number of middle range camera which results from a high sensitivity of the sensors (on average 400 ISO) and which appears in the dark zones of the pictures. With the arrival of the numerical reflex cameras the case is almost not posed, except if you work with sensitivities superiors to 800 ISO or objectives of series sold with the camera.

Many softwares makes it possible to mitigate these effects of chromatic noises, which draw towards the reds, the blue ones or the greens, with the detriment of the clearness of the image. This technique which consists in applying a Gaussian blur to the image.

The tutorial that we will see allows to decrease the noise of your photos in a very fast way and easily scriptable under Photoshop.

Once your photograph open in Photoshop, select the background and convert it into copy.

To duplicate the copy then and place it at the top. It is this 2nd copy which will use to us to attenuate the chromatic aberrations.

Define the 2nd opera hat under the mode of fusion “Color”.
 

To then apply a Gaussian blur to this same copy.

Proportion the adjustment of the blur according to the dimension of the photograph and avoid a too great loss of the colors. On average one proportioning between 2 and 8 pixels proves to be sufficient.

Amalgamate your two copies with the order “To flatten the image” and record the whole.

Original picture	Treated picture