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5. Examples
To leave this manual as short as possible, we have decided not to include
externsive examples in this text. But you can find several examples (with
examples of filtered images) on the FilterFormula homepage.
Included in the FilterFormula package, there is a file named ffexmpl.txt
which
contains the sources for several highly sophisticated filters.
To try them, just open them with an ordinary text editor (e.g. "notepad")
and copy the source for the chosen filter into the clipboard. Then change
to your image editing program, invoke the FilterFormula plugin, type the
name into the combobox editing field and press "Enter".
Move the cursor into source code field, and insert the previously selected
code by pressing <Ctrl+V>. Then compile the source (Button "Compile").
If you want, you can give names to the sliders and select their range (according
to their description).
In the following table you can find a very short description of the
filters contained in this file:
-
MOSAIC
-
creates a mosaic-style effect by dividing the image into many small random
polygons.
-
ZOOM
-
creates an effect as if you were changing your zoom lens while having the
camera aperture open.
-
STRUCTURED GLASS
-
creates a simple effect as if you were looking through grain-structured
glass
-
ENHANCE PICTURE CONTRAST
-
this filter enhances the overall image contrast by setting a defined (slider
0) percentage of the image to black and to white, and spread the rest of
the image so that it fills the whole lightness range. This gives quite
vivid effects for values of 1 to 10 %.
-
SIMPLE GAMMA CORRECTION
-
does exactly this.
-
HORIZONTAL BLUR
-
blurs the image as if you were moving the camera during making the photograph.
-
EMBOSS WITH BACKGROUND
-
embosses the image, but uses the selected background color as fill color
(quite nice, available in some, but not all image editors)
-
SHARPEN IMAGE
-
does a simple sharpening by use of a simple convolution kernel filter,
strength can be selected by slider 0.
-
DOTTED IMAGE
-
creates a picture that consists of a number of round dots. The dot size
and the size of the bounding rectangle can be selected. This filter is
shown as an examble in this manual above.
-
HONEYCOMB
-
divides the image into hexagonal areas with the same color (which is the
color of the center pixel of the hexagon)
-
ELLIPSE
-
makes all pixels outside an ellipse (with the image's size) transparent
(works only on layers, not on background!)
-
BUTTONIZE
-
creates a button effect which can be changed in size, light direction and
strength
-
TRIANGLES
-
creates a pattern of rectangles consisting of two triangles - one lighter
and one darker
-
CREATE SEAMLESS PATTERN
-
does exactly this
-
SHADOW W/BACKGROUND
-
creates a hard shadow with background color as shadow color
-
EXTENDED MEDIAN CUT
-
median cut, but you can select also the lightest and darkest neighbouring
pixel
-
RAINBOW
-
paints a rainbow of a selected size, center, radius, and transparency on
the image (can be applied on a background image or on an empty layer)
These filters should be only some samples. We would like to encourage you
to take these filters, change them and experiment with them, or write completely
different ones. There are (nearly) no limits but in your phantasy .....
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