Images

Using the Images property, you can perform the following checks:

Compression: Color/grayscale: Checks the type of compression used for images (color or grayscale) in the PDF document.
Compression: 1-bit: Checks the type of compression used for one bit images in the PDF document.
JPEG compression ratio: Checks whether the JPEG compressed images were compressed to the specified ratio.
16 bits per channel: This check traces all images which use 16 bits per channel.
Alternate images: Checks whether images in the PDF document have alternates defined.
OPI: Checks whether OPI (Open Prepress Interface) information is used in the document.
OPI is incompatible: Checks whether the type of OPI information used in the PDF document is incompatible with the OPI standard used in the workflow.
OPI is missing: This check traces all images for which the high resolution version cannot be found in the location specified in the OPI pointer.
Image is rotated: Checks for images in the PDF document which have been rotated at an angle which is not a multiple of 90⁰.
Image is flipped: Checks for images in the PDF document which have been flipped horizontally.
Image is skewed: Checks for images in the PDF document which have been skewed.
Image is scaled: Checks for images in the PDF document which have not been scaled proportionally.
Resolution: Checks all grayscale, color and 1-bit images in the PDF document.
Checks resolution of a single image page or non single page or all. This is useful in checking pages that contain purely raster data, for example, those that are create using applications such as Adobe Photoshop, MS Paint and others.
Checks if the resolution is lower, lower or equal to a specified value, higher, higher or equal to a specified value or in the range of the specified values. You can also exclude images with height or width smaller than a value you specify from image resolution checks.