PdfImageCompressionOptions
Inheritance: java.lang.Object, com.aspose.ms.System.ValueType, com.aspose.ms.System.Enum
public final class PdfImageCompressionOptions extends System.Enum
Pdf image compression options
Fields
| Field | Description |
|---|---|
| Auto | Automatically selects the most appropriate compression for each image. |
| None | Saves raw image bytes resulting in bigger pdf file sizes. |
| Rle | Run Length compression. |
| Flate | Flate compression. |
| LzwBaselinePredictor | Predictor selection is restricted to PNG Paeth predictor to speed-up the process. |
| LzwOptimizedPredictor | Predictor selection is more complicated and should result in smaller image sizes but taking more time. |
| Jpeg | Jpeg compression. |
| Ccitt3 | /CCITTFaxDecode/DecodeParms/K 0/Columns 173 Does not support transparency. |
| Ccitt4 | /CCITTFaxDecode/DecodeParms/K -1/Columns 173 Does not support transparency. |
Auto
public static final int Auto
Automatically selects the most appropriate compression for each image.
None
public static final int None
Saves raw image bytes resulting in bigger pdf file sizes.
Rle
public static final int Rle
Run Length compression.
Flate
public static final int Flate
Flate compression.
LzwBaselinePredictor
public static final int LzwBaselinePredictor
Predictor selection is restricted to PNG Paeth predictor to speed-up the process. In practice performs surprisingly good. Better than LzwOptimizedPredictor.
LzwOptimizedPredictor
public static final int LzwOptimizedPredictor
Predictor selection is more complicated and should result in smaller image sizes but taking more time. RFC 2083 says it is the best way to go. But on the test data baseline predictor LzwBaselinePredictor kicks ass leaving optimized predictor behind by 25-40% compression rate gains.
Jpeg
public static final int Jpeg
Jpeg compression. Does not support transparency.
Ccitt3
public static final int Ccitt3
/CCITTFaxDecode/DecodeParms/K 0/Columns 173 Does not support transparency.
Ccitt4
public static final int Ccitt4
/CCITTFaxDecode/DecodeParms/K -1/Columns 173 Does not support transparency.