Append Mode: Determines how the new PDF is handled when it shares a name with an existing PDF in the same save location. Overwrite will replace the existing PDF with the new one while Append and Prepend will add the new PDF pages to the end or beginning of the existing PDF, respectively.

Color Setting: Determines how many colors to use when saving the image (also known as "color depth"). Select the desired color depth from the list.  

For color images, use True Color, 256 Color, or 16 Color.  True Color is suited for the highest quality images.  256 Color and 16 Color will produce smaller files, but with less color precision.  Monochrome is black and white, and Grayscale supports many different shades of gray.  If this option is set to fewer colors than the source document includes, unsupported colors will be replaced by their closest available approximation.  Photographs and rendered images should generally use True Color, while schematics and documents with fewer colors can usually be well represented with 256 Color or 16 Color.  

Select from the available options to determine how much (if at all) images should be compressed. The options are:

• Photographs (JPEG): Uses compression designed specifically to work well for PDFs that contain photographs.
  • JPEG Quality: Determines the compression level used for JPEGs. There are five options: Minimum, Low, Medium, High, and Maximum. Minimum will produce an image with the lowest level of precision, but the smallest possible file size. Maximum will create an image with the highest level of precision, but the largest file size. The options between Minimum and Maximum will produce images with properties between those two extremes. Some experimentation may be necessary to find a suitable balance between file size and image quality.
• Graphics (ZIP): Uses compression suitable for graphics and other content.
• Default: Uses the Print Quality settings defined in the General Settings. See General Settings for Word, General Settings for Excel, General Settings for PowerPoint, or General Settings for Outlook.

Enable: Select this option to activate a post-processing operation as part of the PDF creation process. If enabled, a second pass is performed on the PDF to correct certain conditions that may create non-optimal PDFs.

Click Manage to bring up the PDF post-processing settings.

The PDF Post Process Settings are:

• PDF Version: Select the PDF standard to use from the list.
• Process Wipeouts, Text Masks and OLE objects: Select when creating PDFs from AutoCAD drawings that have text masks or wipeouts.  This option is on by default for making PDFs from AutoCAD.
• Fix Striped Images: Select to correct lines or stripes that appear in images.
• Combine Adjacent Images: Select to combine images that are adjacent to one another into a single image.
• Optimize Solid Color Image: Select to convert any solid-color raster images to vector.
• Remove Text Clipping: Select to remove any text near the upper margins of a drawing that appears clipped.
• Simply Clipping Paths: Select to correct excessive clipping paths created around non-rectangular crop boxes which result in large file sizes.

Image: Select the image resolution. Resolution is measured in dots-per-inch (DPI). A higher DPI setting will create a better image but will increase the file size.

Aliasing is the effect that causes jagged lines in diagonal or curved objects due to the square pixels on computer screens and printers. Anti-Aliasing attempts to correct this by smoothing the image using intermediate colors between the line color and background color.  There are different anti-aliasing settings for Text and Graphics. Choose between High, Low, and None for each.

Note: The Graphics anti-aliasing setting will not affect photographs or other raster images. It only applies to vector graphics.