Figure 11.137.
The same image, before and after applying GIMPressionist
You can find this filter via the image menu under
Filters->Artistic->GIMPressionist
It's the king of Artistic filters. It can do what Cubism and Apply
Canvas do and much more. It gives your image the look of a painting.
All is going as if your image was painted again on a paper and with a
brush you'd have choosen. It works on the active layer or selection.
11.5.2.
Parameter Settings
Preview
All your setting changes will appear in the Preview without
affecting the image until you click on OK.
The Update button refreshes the preview
window (it is not automatical, Gimpressionist has so much work
to do!), and the Reset button reverts to
the original image.
Presets
Figure 11.138.
“Presets” tab options
GIMPressionist has a lot of parameters. When combined, they
give an astronomical number of possibilities. So, it is important,
when an interesting preset has been found, to save it and also to
send it to the plugin author if exceptionnal. Per contra, the
intricracy of all these parameters makes difficult understanding
and foreseeing how each one works.
Save Current: Save current parameters.
You can give a name in the input box on the left and a short
description in the dialog that appear.
Apply: Load the parameters of the
selected preset in the list.
Delete: Delete the selected preset. You
can delete only the presets you have created.
Refresh: Update the preset list.
Paper tab
Figure 11.139.
“Paper” tab options
This tab concerns the texture of the canvas your image will be
painted on. You have a list of textures and a
Preview for the selected texture. A
description is displayed on the right for every texture when
selected.
Invert
Inverts the paper texture: what was a hollow turns to a
bump and vice-versa.
Overlay
Apply the paper as it, without embossing it. It looks like
if a transparent paper has been overlayed on the image.
Scale
Specifies the scale of the texture (in % of the original
file): controls the graininess of the texture.
Relief
Specifies the amount of embossing to apply (3-150).
Brush tab
Figure 11.140.
“Brush” tab options
"Brush" is a general term for any material used to paint. A list
of brushes is available with a Preview for
the selected one.
Gamma
Changes the gamma (luminosity) of the selected brush. The
gamma correction brightens or darkens midtones.
Select
You can also use a brush pattern you have created by
selecting its image (arrow button on the Select line).
This image must be on your screen before you launch the
filter to be taken in account. Of course, don't use big
images.
If your image has several layers, they also will be
displayed in the Select list and can be used as a brush.
When selected, the layer appears in the brush preview and
the normal brush is deselected.
The Save as allows you to save the
selected brush.
Aspect ratio
Specifies the brush proportions, height (0 -1) and width
(0 +1).
Relief
Specifies the amount of paint used for each stroke. This
may evoke painting with a palette knife.
Orientation tab
Figure 11.141.
“Orientation” tab options
This tab allows to set the orientation of the brush strokes.
A painter is not obliged to go over with the same paintbrush
angle. To perform some effects, he can vary their orientation.
Directions
With this option, you can set how many times
the brush will pass through a same place, with each time a
different direction, resulting in a more and more thick
paint.
Start Angle
Specifies the general direction of the strokes, the angle
that the angle range will start from. Directions are often
choosen to give some movement to the image.
Angle Span
Specifies the angle, the sector, of the stroke "fan".
Orientation
Specifies the direction of the brush strokes.
Value: Let the Value (luminosity)
of the region determine the direction of the stroke.
Radius : The distance from the
center of the image determines the direction of the
stroke.
Random : Select a random
direction for each stroke.
Radial : Let the direction from the
center determine the direction of the stroke.
Flowing : Not a direction
question here: the strokes follow a "flowing" pattern.
Hue : Let the hue of
the region determine the direction of the stroke.
Adaptive : The brush direction that
matches the original image the closest is selected.
Manual : The Edit
button opens the
Edit
orientation Map dialog that allows you to set the
directions manually.
Size tab
Figure 11.142.
“Size” tab options
This tab allows you to set the number of brush sizes that will be
used to paint, the limits of variation of these sizes and the
criterion used to determine them.
Three Sliders
You can specify how many brush sizes are to be used and
their sizes.
Sizes: The number of brush sizes to
use.
Minimum Size and
Maximum Size : The brush sizes are
between these two values. Greater the size, greater the
length and width of strokes.
Sizes
You have there options to specify how the size of strokes
will be determined.
Value: Let the Value (luminosity)
of the region determine the size of the stroke.
Radius : The distance from the
center of the image determines the size of the stroke.
Random : Select a random size for
each stroke.
Radial : Let the direction from the
center determine the size of the stroke.
Flowing : Not a length question
here: the strokes follow a "flowing" pattern.
Hue : Let the hue of
the region determine the size of the stroke.
Adaptive : The brush size that
matches the original image the closest is selected.
Manual : The
Edit button opens the
Size Map Editor
That allows you to specify the size of strokes by yourself.
Placement tab
Figure 11.143.
“Placement” tab options
In this tab you can set how strokes will be distributed.
Placement
In the preview of the Orientation Map Editor, all small
arrows look like a flow around objects. Inside this flow,
strokes may be placed in two different ways:
Randomly: Places strokes ramdomly.
This produces a more realistic paint.
Evenly: Strokes are evenly
distributed across the image.
Stroke Density
The greater the density the closer the strokes. With a low
density, the paper or background may be visible in
unstroke areas.
Centerize
Focus brush strokes around center.
Color tab
Figure 11.144.
“Color” tab options
In this tab, you can set what the stroke color will be.
Color
You can set the stroke color in two ways:
Average under brush: Stoke color
is computed from the the average of all pixels under
the brush.
Center of brush: Samples the
color from the pixel in the center of the brush.
Color Noise
This slider, and its input box, allow you to introduce
noise in the stroke color, that will look less homogenous.
General tab
Figure 11.145.
“General” tab options
In this tab you can set what will be the background and the relief
of brush strokes.
Background
Keep Original: The original image
will be used as a background.
From Paper: Copy the texture of
the selected paper as a background.
Solid: By clicking on the color
dwell you can select a solid colored background.
Transparent: Use a transparent
background. Only the painted strokes will be visible.
This option is available only if your image has an
Alpha channel.
Paint Edges
If it is disabled, a thin border will not be painted around
the outside border of the image.
Tileable
If checked, the resulting
image will be seamlessly tileable. The right side will match
the left side and the top will match the bottom. This is
interesting if your image will be repeatedly used in a Web
background.
Drop Shadow
Add a shadow effect to each brush stroke.
Edge Darken
How much to darken the edges of each brush stroke. This
increases paint relief or thickness.
Shadow Darken
How much to darken the brush shadow.
Shadow Depth
How far apart from the object the drop shadow should be.
Shadow Blur
How much to blur the drop shadow.
Deviation Threshold
A bail-out value for adaptative selections of brush size.
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