Quick links to procedures on this page:
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As you paint with the Image Hose, Corel Painter selects images from the nozzle file based on one or more rules. This selection process, known as indexing, determines which images from the many in the nozzle file are delivered from the Image Hose. The Image Hose panel in the Brush Controls palette lets you change the rules for indexing the images.
Image nozzle files can be created with one, two, or three image progressions known as “ranks.” Corel Painter offers these three rankings, so each nozzle file can be identified as a 1-Rank, 2-Rank, or 3-Rank nozzle. For more information about the rank system, refer to Designing Nozzles: 1, 2, or 3 Ranks.
The following indexing rules are available for each rank in Corel Painter:
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None returns one element only — the last in the rank.
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Velocity indexes images from the rank based on the speed of the stroke. A faster
stroke delivers elements from later in the rank. Velocity is often used with a mouse
to mimic pressure. Velocity can be difficult to control. For this reason, you might
want to use it in a rank with few elements.
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Direction indexes images from the rank based on the direction of the stroke. The
first item in the rank corresponds to a left-to-right stroke (toward 3 o’clock). As the
stroke direction progresses counterclockwise, the Image Hose delivers subsequent
images from the rank. The number of elements in the rank determines the
directional change required to index a different element. For example, a nozzle file
that contains 72 images at progressive angles delivers a different item at every 5° of
stroke direction (360° divided by 72 equals 5°).
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This Arrow nozzle is an example of indexing based on Direction.
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Pressure indexes images based on stylus pressure. Greater pressure selects images
from later in the rank. Pressure works only with pressure-sensitive tablets. Pressure
is a great control for requesting images from a nozzle. For example, if you set up
your nozzle file to progress from small to larger images, heavier strokes deliver
larger images.
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Wheel indexes images based on the wheel setting on an airbrush stylus.
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Tilt indexes images based on the tilt of the stylus. Not all stylus models convey this
information. This control does not work with a mouse.
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Bearing indexes images based on the position of the stylus. Not all stylus models
convey this information. This control does not work with a mouse.
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Rotation indexes images based on the rotation of a flat-tip stylus that supports
360-degree rotation.
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Source delivers images based on the luminance of pixels in the clone source (or
current pattern if you have not set a clone source). The pixels of the working
document have a direct correspondence with the pixels of the clone source image.
As the luminance increases, Source delivers images from later in the rank. For best
results, the clone source should have the same dimensions as the document in
which you’re working. For more information on setting up and using a clone
source, refer to Painting in the Clone. Depending on the nozzle you’re using,
Source can be quite useful. For example, if the source image is black on the left and
progresses through gradations to white on the right, the Image Hose delivers
images from the start of the rank at the left of the document, in the dark area. As
the brush moves to the right into the lighter area, the Image Hose delivers images
from later in the rank. To take advantage of this feature, you may want to create a
special source image for the single purpose of controlling the Image Hose. The
clone source image or pattern for controlling the Image Hose may be grayscale.
Remember, Corel Painter uses only the luminance values.
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Indexing based on Source.
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Random selects images from the rank at random. Randomness can add irregularity
of color and texture to the areas you paint with the Image Hose. This contributes
to the aesthetics of the painting, because minor irregularities occur in natural
structures.
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Sequential indexes images in the order they appear in the rank — moving left to
right, and top to bottom.
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Left: sequential indexing. Right: random indexing.
| To change the indexing rule |  |
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Choose Window  Brush Control Panels Image Hose.
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For each rank in the nozzle, choose an indexing rule from the list box.
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If necessary, adjust the Direction slider.
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If you want to invert the effect of the indexing rule, enable the Invert Rank check box. For example, if you choose Pressure for an indexing rule, greater stylus pressure selects images from later in the rank. Inverting the rank produces the opposite result — greater stylus pressure delivers images from earlier in the rank. |
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The indexing rules for Rank 2 and Rank 3 have no effect on a 1-Rank nozzle.
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