Optimizer.MonoImageSettings
extends Object| java.lang.Object | |
| ↳ | com.pdftron.pdf.Optimizer.MonoImageSettings |
Class Overview
A class that stores image downsampling/recompression settings for monochrome images.
Summary
| Constants | |||||||||||
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| int | e_ccitt | CCITT group 4 compression | |||||||||
| int | e_default | The constant e_default | |||||||||
| int | e_flate | Flate compression | |||||||||
| int | e_jbig2 | JBIG2 compression | |||||||||
| int | e_none | No compression | |||||||||
| int | e_off | The constant e_off | |||||||||
| Public Constructors | |||||||||||
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MonoImageSettings()
create an MonoImageSettings object with default options
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| Public Methods | |||||||||||
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| void |
forceChanges(boolean force)
Sets whether image changes that grow the
PDF file should be kept.
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| void |
forceRecompression(boolean force)
Sets whether recompression to the specified compression
method should be forced when the image is not downsampled.
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| void |
setCompressionMode(int mode)
Sets the output compression mode for monochrome images
The default value is e_ccitt
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| void | setDownsampleMode(int mode) | ||||||||||
| void |
setImageDPI(double maximum, double resampling)
Sets the maximum and resampling dpi for monochrome images.
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| void |
setJBIG2Threshold(double jbig2_threshold)
Sets the quality for lossy JBIG2Decode compression mode.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Constants
public static final int e_ccitt
CCITT group 4 compression
public static final int e_default
The constant e_default
public static final int e_flate
Flate compression
public static final int e_jbig2
JBIG2 compression
public static final int e_none
No compression
public static final int e_off
The constant e_off
Public Constructors
public MonoImageSettings ()
create an MonoImageSettings object with default options
Public Methods
public void forceChanges (boolean force)
Sets whether image changes that grow the PDF file should be kept. This is off by default.
Parameters
| force | if true all image changes will be kept. |
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public void forceRecompression (boolean force)
Sets whether recompression to the specified compression method should be forced when the image is not downsampled. By default the compression method for these images will not be changed.
Parameters
| force | if true the compression method for all images will be changed to the specified compression mode |
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public void setCompressionMode (int mode)
Sets the output compression mode for monochrome images The default value is e_ccitt
Parameters
| mode | the compression mode to set |
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public void setDownsampleMode (int mode)
public void setImageDPI (double maximum, double resampling)
Sets the maximum and resampling dpi for monochrome images. By default these are set to 450 and 300 respectively.
Parameters
| maximum | the highest dpi of an image before it will be resampled |
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| resampling | the image dpi to resample to if an image is encountered over the maximum dpi |
public void setJBIG2Threshold (double jbig2_threshold)
Sets the quality for lossy JBIG2Decode compression mode. The threshold is a floating point number in the range from 4 to 9 The default value for JBIG2 is 8.5. The setting is ignored for FLATE.