ABB digital input and output module 3BSE008508R1 DI810

ABB digital input and output module 3BSE008508R1 DI810

Technical data of product parameters

An3BSE008508R1 DI810 mask (an image XObject whose ImageMask entry is true) is a monochrome image in which each sample is specified by a single bit. However, instead
of being painted in opaque black and white, the image mask is treated as a stencil
mask that is partly opaque and partly transparent. Sample values in the image do
not represent black and white pixels; rather, they designate places on the page that
should either be marked with the current color or masked out (not marked at all).
Areas that are masked out retain their former contents. The effect is like applying3BSE008508R1 DI810
paint in the current color through a cut-out stencil, which lets the paint reach the
page in some places and masks it out in others.
An image mask differs from an ordinary image in the following significant ways:
3BSE008508R1 DI810
• The image dictionary does not contain a ColorSpace entry because sample
values represent masking properties (1 bit per sample) rather than colors.
• The value of the BitsPerComponent entry must be 1.
• The Decode entry determines how the source samples are to be interpreted. If
the Decode array is [0 1] (the default for an image mask), a sample value of 0
marks the page with the current color, and a 1 leaves the previous contents unchanged. If the Decode array is [1 0], these meanings are reversed.
One of the most important uses of stencil masking is for painting character
glyphs represented as bitmaps. Using such a glyph as a stencil mask transfers only
its “black” bits to the page, leaving the “white” bits (which are really just background) unchanged. For reasons discussed in Section 5.5.4, “Type 3 Fonts,” an
image mask, rather than an image, should almost always be used to paint glyph
bitmaps.In PDF 1.3, the Mask entry in an image dictionary may be an image mask, as described above under “Stencil Masking,” which serves as an explicit mask for the
primary (base) image. The base image and the image mask need not have the
same resolution (Width and Height values), but since all images are defined on3BSE008508R1 DI810

the unit square in user space, their boundaries on the page will coincide; that is,
they will overlay each other. The image mask indicates which places on the page
are to be painted and which are to be masked out (left unchanged). Unmasked areas are painted with the corresponding portions of the base image; masked areas3BSE008508R1 DI810

are not.

Product picture display

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