產品說明
有了這個測試卡的幾個彩色攝像機可以同時調整膚色的近似均勻再現性。首先照相機必須進行灰度的對數進行調整（TE108; TE109; TE153)。通過使用TE109改變BBC61而不改變光圈制成。與T13測試卡配合使用完成電影彩色膠片的測試膚色再現性。
這張測試卡為了避免表面因為光源照射的光澤影響攝像機檢測結果，所以測量時測試卡要向前傾斜20°角。為此可使用一個折返剪輯。鏈子可以用于在其傾斜位置（例如在表裝入SAD460橫桿上）固定測試卡。
可以通過調節鏈條的長度來控制測試卡的角度改變。當測試卡的上緣與垂直位置距離是17厘米時達到一個20°的傾斜。
為了延緩測試卡褪色現象，使用時盡量用UV輻射較低的光照照射。使用之后測試卡應該用塑料蓋蓋好。
The flesh tone test chart is designed for evaluating the flesh tone rendition of electronic cameras.
The chart developed by the BBC London is a 4 color offset print. The spectral remission of the flesh tones approximates the natural flesh tone very well. Although the steep rise at the wavelength of about 580nm is somewhat to low (see Ill.2). The background is illuminated evenly but not absolutely neutral.
Ill. 2
With this chart several color cameras can be adjusted simultaneously to an approximate uniform rendition of flesh tones. First cameras have to be adjusted with a logarithmic gray scale (TE108; TE109; TE153). By using the TE109 the change to be BBC61 can made without changing f-stop. In combination with the T13 the chart is suited for testing flesh tone rendition of cine color films.
The chart has to be illuminated in a way that avoids glossy effects on the surface for all cameras involved. To achieve this, that chart should be tilted forward up to 20°. For this a foldback-clips can be used. Th e chain can be used for fixing the test chart in its tilted position (e.g. at the upper cross bar of the table mount SAD460). The length of the chain and thus the angle of the test chart can be varied by putting the side pieces into other links of the chain. A 20° tilt is reached when the upper rim of the chart is 17cm of the vertical position.
To delay the inevitable fading of the colors the chart should be illuminated if possible with light of a low portion of UV radiance. After use, the chart should be covered with the plastic cover.
The chart is available only in the A540 version.
More information about the BBC61:
E.W. Taylor; S.J. Lent: BBC Test Card No. 61 (Flesh Tone Reference) – Colorimetric and Other Optical Considerations.
SMPTE Journal, Vol. 87, February 1978, p. 76-78
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