Strong images of world photography meets success with exploration of modern photographic creation, drawing a plural journey through the different eyes of contemporary photographers.
HD photography allows to get out of the clutter on the world, reveal hidden realities, to improve understanding between peoples: because that photography remains an incomparable revealer of the tremendous upheaval.
What is high definition photography
High definition photography is a technique that allows you to realize an image with a resolution much higher than that of a standard camera. The interest of high resolution photography is to offer a very high level of detail, as shown in the photograph below cons.
While a photograph has an average of ten megapixels, HD photos can reach resolutions of several gigapixels (1 gigabyte = 1000 mega). The technique used to obtain these images in very high resolution is identical to panoramic photography: the image is actually an assembly of a multitude of photos.
However, unlike the panoramic where the photographer chooses a wide angle lens decrease the number of shots, in HD photography he will choose a telephoto lens in order to have the maximum details by photo. The more the “zoom” used will be important, the more level of detail obtained will be high. In return, it will take more of photos to cover the same surface.
A high definition image is actually an image recomposed, some photographers having assembled up to 1600 pictures! The principle of shooting as a mosaic is enough simple. The fastest method is to “scan” the image by successive bands. In order for the software to correctly assemble the photos, it must be able to find similarities between them.
It is therefore advised that the photos overlap, that is to say that they slightly overlap. The recovery value allowed is about 25%. If the recovery is too low, the software assembly will fail to position the photo. If the recovery is too important, the shooting will take more time as necessary.
High resolution photo shooting types
Shooting is the stage that requires the most preparation and attention because it is here that all quality is played of the final image, the least error being difficult or impossible to catch up. Depending on the degree of precision desired and possessed material, there are three ways to take pictures of a high definition mosaic.
The first possibility is to take the photographs freehand, the recovery between each image being defined by the photographer by looking at the screen or the viewfinder. This is perfect for assembling a dozen photos, but this method is no longer usable. Indeed, during a hand-held shooting lifting, it is very difficult to make a perfectly horizontal scan. If the photo has several bands, the risk is that the ranks are not perfectly parallel, and therefore there is no vertical overlap between the bands.
The final image would then have “empty” areas. The second method is to use a tripod. The ball head at the top of the tripod to block one of the two rotations, we are sure to have good ranks parallel and therefore a good recovery in both directions. The other advantage of the tripod is to be stable which gives the possibility to use focal lengths without the risk of having a blurred image, as well as allowing to make use of different photo angles. Again, the photographer must look in the viewfinder between each photo to determine the correct position and adjust the recovery.
The last possibility is to use a panoramic head. In the same way as the ball of the tripod, the head panning allows two rotations, but has the advantage of giving a reading of the photo angles for each of the two axes. With this information, it is no longer necessary to look in the viewfinder between each photo, the photographer having only to rotate the panoramic head at a certain angle between each photo. The value of this angle is calculated easily depending on the camera, focal length and desired coverage.
Camera pupil adjusting
In high resolution photography, it is not necessary to adjust the position of the entrance pupil of the camera. Indeed, when the panoramic head rotates, this circular motion can be seen as a vertical translation and horizontal of the entrance pupil. Therefore, the greater the angle of rotation between each photo, the more these translations are and therefore the parallax problem will be felt. But in HD photography, the camera does not moves only a few degrees between each image. The movement of the entrance pupil between each image is very small, so its position can be considered identical between each photo.
In the recent years the world photography spheres focus on the increased attention to the most original and more engaged approaches. Beyond a decidedly international selection, the aim is to create perfect beautiful examples of the world photography.