YE0178 BlankFilm White Balacing Test Target 4:3 Ratio 100% WHITE TEST CHART Shading Measurement Chart

YE0178 BlankFilm White Balacing Test Target 4:3 Ratio 100% WHITE TEST CHART Shading Measurement Chart

The test chart consists of a blank film between two glass panes. The (reprographic) film is of the same material as the other ESSER TEST CHARTS transparencies (D280, D240, D205).

The test chart is designed for shading measurement under the same lightning conditions as other transparency measurements.

It is possible to perform shading measurements on illuminator (LG2, LE6) without any chart. But then lightning conditions are different to other measurements with test transparencies. By using a test transparency the light intensity of an illuminator changes. This is caused by two superimposed factors

a) the filter effect of the film and glass (25% light absorption) and

b) the light remission of the transparency ack in the illuminator

While factor a) is predominant with the LG2, the remission factor b) is predominant with the lightning sphere LE6, i.e. the light intensity rises significantly when a test chart is inserted. To carry out shading measurement under the same lighting condition as other measurements the use of the YE0178 is essential.

Definition of white shading or white level uniformity

Determination of maximum white level variations in various areas of the picture, when the camera is directed at an evenly illuminated test chart.

Measuring equipment

Oscilloscope; video amplitude meter

Measuring conditions

Gamma correction: ON

Iris aperture: F/4 2/3” CCD

Gain: 0dB

White balanced

The illumination of the test chart has to be adjusted so that the R, G, B output signals are equal to 700mV/75ohms (nominal amplitude). Lens initially focussed on the test chart (or an other suitable test chart

e.g. YE0120) and then de-focussed.

Shading correctors: ON

Zoom: Positioned to minimize the effect of vignetting and shading of the test chart.

Measuring procedures

Measurements are made on the R, G, B signals at the camera output and then repeated for two picture zones defined as follows:

a) within a rectangular zone, the height and width of the picture (zone A)

b) outside this rectangle (zone B)

On the basis of these measurements, the differences of level for R-G, R-B and B-G are calculated and the maximum peak-to-peak variantions recorded for each zone.

Presenting the results

The results, expressed in % of the nominal signal, are recorded in a table:

Suzie Xia
International Sales Dept.
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Shenzhen ThreeNH Technology Co., Ltd
Add: 4/F, Building 8, Nangang Second Industry Zone, Xili, Nanshan District, Shenzhen, 518055 China.
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Shenzhen ThreeNH Technology Co., Ltd

Established in 1998, Shenzhen ThreeNH Technology Co., Ltd. is a high-tech enterprise. We research, develop, produce and market photoelectric detection products in photoelectric detection technology field and color management field. After years of intensive research, 3nh has launched NS series spectrophotometer and NH, NR series colorimeter, ISO12233 resolution test chart, optical image test solution and specific standard illuminant which are widely used in plastic, electronic, paint, ink, textile, garment, printing and dyeing, food, medical, cosmetic, optical image test industries and the field of scientific research, school and laboratory.

Our products are exported around the world. We can provide customization service which has been well received by customers.

3nh cherishes talents, focuses on talents. Company brings together many of high-level, high educated professionals. Among them, undergraduate academic staffs of the total number of company accounted for more than 80%; postgraduate staffs of the total number of company accounted for 30%. It involves the fields of photometry, electronic circuit, embedded system, photoelectric detection, mechanical structure design, optical design, application software, lighting technology electronic commerce and internet. 3nh team has strong capability to design, develop and produce on its own. The company has a large number of innovation patents, core technologies and intellectual property rights of 3nh products.

3nh adheres to “people-oriented, customer first, technological innovation, sustainable development” business philosophy to meet customer demand continuously, to create value for customers and to achieve win-win situation and common development.

3nh owns 2666 square meters with the industry's large R & D,production and marketing service base,environmental assessment report,live real shot--R&D center,laboratory,production site, marketing center,reception desk,reception room,conference room,general manager room,Quality control department,ISO quality management center,training center,exhibition center,storage base...