Texas Instruments MATRIX 3000, DW30 user manual Main Functions

Figure 3. 33. “Midpoint” Examples

Figure 3. 32. “Shape” Examples

Section 3: Operation

Main Functions

Use standard edge blending controls to set the precise width, shape and midpoint you need to blend overlapping edges together smoothly.

‰Blend Width determines how much area is used for blending along an overlapping edge. Slidebar values represent the number of 8-pixel steps used for the blend. For example, a setting of “3” creates a blended edge 24 pixels wide. A setting of “0” signifies no blending. For best results in most applications, use a blend width of 16-48 steps (128-384 pixels).

Ranges: 0-80 horizontal, 0-60 vertical.

‰ Blend Shape determines the rate of roll-off across the blend width, i.e. how quickly the white levels

across the blend change from light and dark. Increasing the Blend Shape setting accelerates the rate of change at both extremes so that less of the region appears mid-

gray (see Figure 3. 32). Decreasing the Blend Shape

setting slows the rate of change so that more of the region appears

mid-gray. For most applications, this subtle control is best left close to 50.

‰ Blend Midpoint determines the white level at the blend midpoint (the point equidistant between the beginning and end of the blend). Increasing the

Blend Midpoint setting creates a blend that appears brighter than the rest of the image. Decreasing the Blend Midpoint setting creates a blend that is darker than the rest of

the image. A setting of 50 means the midpoint is approximately 50%

black—for best results in most

applications, keep fairly close to this default.

013-100149-02 Rev. 1 (01/07) Christie DS+60/DW30/Matrix 3000 User’s Manual 3-63