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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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