MiMoriarty

Trucos de diseño para diseñar como locos

Trepidation or defocusing

For not photographers, like me, but having to deal with their problems and pictures constantly, it is possible that some of their guild’s terminology seem somewhat confusing. Moreover, as happens in this case, is sometimes difficult to distinguish when you aren’t photographers, when a picture is blurred and when trepidated. In both cases the result is a picture that lacks the required clarity.

First of all I must say that I have found no magic formulas to solve any of these problems by using image-editing applications. The focus filters can be of some help, especially in blurry or moved photos, but always within the limits set by the tool and the image resolution of the photo in question.

I will begin, therefore, differentiating a problem of another:

  • Trepidation: a picture is jittered when you moved the camera at the time taking the picture. The photos show trepidation have double or triple contour on objects in focus.
  • Defocus: or more commonly blur, defocus pictures occurs when the object or objects protagonists of the image are wholly or partially outside the focal length of the camera. This causes the main image lacks sharpness. Sometimes they become confused photos ‘blurred’ with pictures ‘moved’, when any of the above objects move too fast for the shutter speed and aperture set.

In the above image can appreciate the blurred contours characteristic of camera shake, to the left. The right side image shows the lack of sharpness caused by a mismatch of the focal distance.

In some web pages is detailed how to use sharpening filters to fix focus and blur from out of focus photos, however, as I said at the beginning of this publication, it is necessary to consider the limitations of photography and the filter itself.

The technique used by the algorithm is to contrast the focus of the image’s areas in which there are large differences in brightness, ie clarify light pixels and darken the dark ones. For this reason it is possible to improve performance by presetting photography lighting using shadows/highlights or levels, to give some examples, in order to have better lighting on which to apply the filter approach. The major drawback of this algorithm is that by contrasting an area around the edge of the object tends to create halos around it, resulting to clarify the lightest pixels.

The Smart Sharpen filter provides some extra tools designed to further improve the chances of success in struggling with these problems. The radius option lets you adjust the number of pixels affected by the filter, reducing allows you to select what type of problem you need to solve (motion blur), and, finally, the most accurate tab offers the possibility of minimizing the halo effect that arises focus images.

Another possibility is to use Unsharp Mask. This filter operates similarly to the filter focus, but instead of automatically detecting edges from the brightness contrast thereof offers the possibility of introducing a sampling rate so as to obtain greater control in the process of focus .

In previous publications that dealt photo manipulations I mentioned the possibility of using a high pass filter set in overlay or soft light mode to focus images once you have completed the process of retouching. This method is very helpful to anyone suffering images aforementioned problems, which is why I do not recommend using it when facing an jittered image or really unfocused.

About mimoriarty

Diseñador gráfico multidisciplinar; me gustaría trabajar y compartir experiencias con diseñadores de todo el mundo

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This entry was posted on October 3, 2012 by in Trucos de diseño, multilanguaje, Conocimientos and tagged , , , , , .

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