TiffCompression enumeration

TiffCompression enumeration

Specifies what type of compression to apply when saving page images into a TIFF file.

Members

NameDescription
NONESpecifies no compression.
RLESpecifies the RLE compression scheme.
LZWSpecifies the LZW compression scheme. In Java emulated by Deflate (Zip) compression.
CCITT3Specifies the CCITT3 compression scheme.
CCITT4Specifies the CCITT4 compression scheme.

Examples

Shows how to select the compression scheme to apply to a document that we convert into a TIFF image.

doc = aw.Document()
builder = aw.DocumentBuilder(doc)

builder.insert_image(IMAGE_DIR + "Logo.jpg")

# Create an "ImageSaveOptions" object which we can pass to the document's "save" method
# to modify the way in which that method renders the document into an image.
options = aw.saving.ImageSaveOptions(aw.SaveFormat.TIFF)

# Set the "tiff_compression" property to "TiffCompression.NONE" to apply no compression while saving,
# which may result in a very large output file.
# Set the "tiff_compression" property to "TiffCompression.RLE" to apply RLE compression
# Set the "tiff_compression" property to "TiffCompression.LZW" to apply LZW compression.
# Set the "tiff_compression" property to "TiffCompression.CCITT3" to apply CCITT3 compression.
# Set the "tiff_compression" property to "TiffCompression.CCITT4" to apply CCITT4 compression.
options.tiff_compression = tiff_compression

doc.save(ARTIFACTS_DIR + "ImageSaveOptions.tiff_image_compression.tiff", options)

if tiff_compression == aw.saving.TiffCompression.NONE:
    self.assertLess(3000000, os.path.getsize(ARTIFACTS_DIR + "ImageSaveOptions.tiff_image_compression.tiff"))

elif tiff_compression == aw.saving.TiffCompression.RLE:
    self.assertLess(6000, os.path.getsize(ARTIFACTS_DIR + "ImageSaveOptions.tiff_image_compression.tiff"))

elif tiff_compression == aw.saving.TiffCompression.LZW:
    self.assertLess(200000, os.path.getsize(ARTIFACTS_DIR + "ImageSaveOptions.tiff_image_compression.tiff"))

elif tiff_compression == aw.saving.TiffCompression.CCITT3:
    self.assertGreater(90000, os.path.getsize(ARTIFACTS_DIR + "ImageSaveOptions.tiff_image_compression.tiff"))

elif tiff_compression == aw.saving.TiffCompression.CCITT4:
    self.assertGreater(20000, os.path.getsize(ARTIFACTS_DIR + "ImageSaveOptions.tiff_image_compression.tiff"))

See Also