ORIS PDF Tuner Version 4.4.8 User Manual - image2output - Support

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15 Using Filter Layers
Filter layers allow you to make image modifications on a layout. You can
e.g. improve the colors of an image without having to modify the image
file. There is a separate type of filter layer for each image modification:
• Gradation changes
• Color transformation
• Conversion to grayscales
• Sharpening/Softening
• Adding noise
• Removing noise
• Pixelation (mosaic filter)
A filter layer acts on all layers (of any type) located below it, i.e. layers
with a lower layer number. If there are several filter layers placed upon
each other, the effects add to each other. The filter layer itself has no color
and is therefore invisible if there are no layers located below it.
Filter layers are handled just like any other layer. They can e.g. be duplicated,
resized, mirrored, soft-edged or set to transparent.
Note:
You should only apply filter layers to low-res page elements such as images
or gradients. All high-res elements modified by filter layers will be
output with CT image resolution. There is only one exception:
If 1-bit linework (such as CopyDot data) is modified by gradation layers
and output in monochrome TIFF format with CCITT Group 4 compression,
the linework resolution will be retained. Note that a gradation layer
is always applied to the entire linework, even if it does not cover the linework
completely.
ORIS PDF Tuner Version 4.4.8 User Manual 15-1
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