preblend_images property

PdfSaveOptions.preblend_images property

Gets or sets a value determining whether or not to preblend transparent images with black background color.

@property
def preblend_images(self) -> bool:
    ...

@preblend_images.setter
def preblend_images(self, value: bool):
    ...

Remarks

Preblending images may improve PDF document visual appearance in Adobe Reader and remove anti-aliasing artifacts.

In order to properly display preblended images, PDF viewer application must support /Matte entry in soft-mask image dictionary. Also preblending images may decrease PDF rendering performance.

The default value is False.

Examples

Shows how to preblend images with transparent backgrounds while saving a document to PDF.

doc = aw.Document()
builder = aw.DocumentBuilder(doc)
img = drawing.Image.from_file(IMAGE_DIR + 'Transparent background logo.png')
builder.insert_image(img)
# Create a "PdfSaveOptions" object that we can pass to the document's "save" method
# to modify how that method converts the document to .PDF.
options = aw.saving.PdfSaveOptions()
# Set the "preblend_images" property to "True" to preblend transparent images
# with a background, which may reduce artifacts.
# Set the "preblend_images" property to "False" to render transparent images normally.
options.preblend_images = preblend_images
doc.save(ARTIFACTS_DIR + 'PdfSaveOptions.preblend_images.pdf', options)

See Also

• module aspose.words.saving
• class PdfSaveOptions