It is produced in a sheet of paper or a technical process screen are very complex and prone to errors. For me, they succeeded when they have given the impression that the viewer as close to the original. This leaves plenty of room for subjective preference.
Restaurateurs requiring precise images of artwork:
To determine and cost justification for clients
To document the condition before / after
As the material for self promotion in print and online
Artists can use their hard work like this:
If the fax, the last place in the original can sell
I give the example of an acrylic painting (20 x 20 cm) of the Bonn Artists Becker This I imagine my methods. The result is a quality that is far beyond the scanner or camera to simple dish. highly professional equipment can make it even better, but the cost is about ten times faster per frame.
If you move the cursor over the image for comparison, it seems to be the best version of the work. Note that on the monitor, but only in the best FineArt printing differences are clearly visible.
Amateur recording in daylight
The image was taken with an outdoor enthusiast camera during the day. It is striking emphasis on the canvas, because the light is produced mainly sideways. Depending on the preference of this type of device, the contrasts, the colors are too strong and too flashy. The image has a tint of color to blue and magenta, particularly visible in a semicircle at the top right, which should be neutral gray and the stain on the bottom right corner. The significant change in rates is the witness box because I do not Repro Aufnahmewin- deductible.
Studio with flashing lights
Only in the studio with the exact position of the object, the camera and light sources and adjusting the temperature constant color temperature, reproducible results are possible. However, there are problems. Although the angle of 45 degrees only lit in the small upper lights (visible in gray semicircle) and chroma usually suffers under reflected light. Significantly (see. Red wines in particular), color variations, resulting from the fact arise sensors today (whatever the price) is far from the reproduction right color.
Studio with polarization filter
The reflections of the problem may occur with crossed polarizing filters. Before the studio flashes come polarizing filter, the release swinging a single plane of light. lens, a polarization filter is mounted on an angle at 90 degrees. Reflections can vollkom- men are deleted and the colors are much stronger (left to see the lack of reflection image edge and highlights in gray half circle). Unfortunately, therefore, the paint is reduced to a pure color, the perception of the surface of the tissue structures is lost.
Studio shot with polarizing filters and correction sensor
Is software that recently on the market, with the aid of which it is possible to compensate for the use of chromatic aberration of the camera sensor for each color reference plate with Beleuchtungsver defined ratios. The process is quite high and costly, but leads to better results. Although the color variations of the sensors are, in general, to a deltaE 10 to 12, this value falls to a DeltaE 2 to 4, it is the perceptibility of speed limit. (DeltaE is a measure of the color differences. (See, for example. As Wikipedia)
Studio shot even position light
At the expense of color purity can communicate with another studio flash, which is used as a position light, the structure of the surface must be particular in the light again. The incident occurs at a very small angle, so no reflections are to be feared. The side light generates smaller shaded areas on the canvas, so that the general exchange of views. However, the effect of the image, in my opinion, the immediate perception is closer, there is also the true light GE Malde changed and so distinguishes the suspended Licher perception.
Take 5 (click to enlarge)
Specific rules for repro photography
The optical axis
During recording, the device must be placed exactly on the central axis, so that the object plane and the sensor plane are aligned perfectly parallel. I work with a rail system and control the optical axis with a mirror.
With photos with carriers or images of rigid support, flatness is usually not a problem. Laminating often leaves a glass slide that is not a good solution because the glass surfaces always have a visual impact is used. Therefore, I use a suction plate can be placed in flatness even stronger corrugated.
Depending on the size and type of presentation studio flashes or normal light boxes reflectors.
These distances are controlled by a convenient laser rangefinder. A flash tube, the uniformity of illumination over the entire image area is verified.
The playing surface has the character image. Neither area (paper fiber, fabric, wood, etc.), even in mass color (oil paint, chalk, pencil, etc.) looks may be reproduced or even atypical “enlightened”.
Although the strokes look in oil painting, but must clearly and prominently shown no exaggeration. Particularly difficult are reproductions of paintings with brilliant surfaces.
Digital camera resolution system is perfectly suited to a side length of about 1 meter details allocation models. For larger sizes, it can be useful, with the help of a “Panorama” (z. B. twelve individual records to 2.40 x 1.80 size of the object) to provide image information is necessary.
There is a lot of nonsense about the importance of megapixels distributed. Ultimately, it is essential to the size of the viewing distance in the future use will be. To understand this, it must be said that the film will be seen over 2 million pixels for 80 square meters of fabric as sharp enough.