UNITROL1000 analog input module ABB warehouse stock
Technical data of product parameters
Note: If the Do operator is invoked more than once for a given transparency groupUNITROL1000
XObject, each invocation is treated as a separate transparency group. That is, the
result is as if the group were independently composited with the backdrop on each
invocation. Applications that perform caching of rendered form XObjects must take
this requirement into account.
The actions described above occur only for a transparency group XObject—a
form XObject having a Group entry that designates a group attributes subdictionary whose group subtype (S) is Transparency. An ordinary form XObject—
one having no Group entry—is not subject to any grouping behavior for transparency purposes. That is, the graphics objects it contains are composited individually, just as if they were painted directly into the parent group or page. When the pattern is later used to paint a graphics object, the color, shape, and
opacity values resulting from the evaluation of the pattern definition are used asUNITROL1000
transparency compositing formulas. This painting operation is subject to the values of the graphics state parameters in effect at the time, just as in painting an object with a constant color.
Unlike the opaque imaging model, in which the pattern cell of a tiling pattern can
be evaluated once and then replicated indefinitely to fill the painted area, the
effect in the general transparent case is as if the pattern definition were reexecuted independently for each tile, taking into account the color of the backdrop at
each point. However, in the common case in which the pattern consists entirely of objects painted with the Normal blend mode, this behavior can be optimizedUNITROL1000
by treating the pattern cell as if it were an isolated group. Since in this case the
results depend only on the color, shape, and opacity of the pattern cell and not on
those of the backdrop, the pattern cell can be evaluated once and then replicated,
just as in opaque painting.
Note: In a raster-based implementation of tiling, it is important that all tiles together be treated as a single transparency group. This avoids artifacts due to multiple
marking of pixels along the boundaries between adjacent tiles.
Product picture display
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Introduction to main products
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