Quantum Data 801GC, 801GF, 801GX manual Built-In Images

following illustration. The patches are located in each corner of the main image and in the center. They’re oriented with the highest resolution and contrast boxes closest to the outside corners. The 48%-53%, 48%-51% and 50%-51% level patches are omitted in the secondary version.

4)Gray-Scale Boxes – Twelve (12) boxes at eleven (11) intensity levels are clustered around the center of the main image. They start at 0% and increase in 10% steps to 100% with two (2) boxes at a 50% level. All of the gray-scale boxes are omitted in the secondary version.

5)Gamma Check Dither Box – A small box is drawn inside the right-hand 50% gray-scale box. The box is half the width and height of the larger box. The box consists of a checker- board of alternate one-on and one-off pixels. The alternate pixels have levels of 0 and 100%. This smaller box is not part of the original SMPTE specification and is omitted in the secondary version.

6)Contrast Boxes – Two (2) boxes are drawn adjacent to the gray-scale boxes. They’re at 0 and 100% levels. There are smaller boxes drawn inside each box at 5 and 95% levels. The contrast boxes are omitted in the secondary version.

7)Black & White Windows – Two (2) horizontal bars are located above and below the gray- scale boxes. Their height equals 8% of the display height . There are half - size bars centered in the larger bars. In the primary version, the dark portion of the windows is at a 5% level and the bright portion is at a 95% level. Zero and 100% levels are used in the secondary version.

4-56 Chapter 4: Built-In Images Model 801GC, 801GF & 801GX¥Rev. X1