About Arbortext Styler > Document Preview and Publishing > PTC ALD PDF Configuration File (.appcf) > GrayscaleImages element (optional)
  
GrayscaleImages element (optional)
GrayscaleImages
Parent Elements
Required
Child Elements
No
Attributes of GrayscaleImages define how to compress grayscale images in a PDF file.
* 
This option is ignored for linked images when passthrough is enabled. See Images for information.
Attributes of GrayscaleImages
Property
Permitted values
downsampleDPI
The size to which to downsample images
Number (default value 300)
downsampleMode
Algorithm for downsampling
When downsampleMode is set to a value other than off, and the DPI of an image is equal to or above the value of downsampleThreshold, the image is downsampled to downSampleDPI.
* 
linked="original" must be set for Images for downsampling settings to have an effect in PDF output.
off (default)
subsample — fastest, uses nearest pixel from original image
The original image type will not be changed with this method.
average — uses average of the group of pixels surrounding the nearest pixel from the original image
bicubic — slowest but best quality, an enhanced bicubic algorithm
downSampleThreshold
The threshold size of an input image
Number (default value: 450)
type (required)
Compression type
auto — use the most appropriate compression for the type of image
none — do not compress
flate (default) — Flate encoding
jpeg — JPEG compression
quality
The amount of compression to apply to the images when printing to JPEG
min
low
med (default)
high
max