Which errors are included in the preflight script?

The standard preflight profile script included in tFLOW has the following errors:

ErrorError description
Text is smaller than minimum size
optional
Font is not validAt least one embedded font is syntactically incorrect.
Font not embeddedFont is not embedded in the PDF file.optional
Image is not validThe data stream for at least one image is syntactically incorrect.
Image resolution too low
optional
White text is not set to knock outWhite objects should be set to knock out, as otherwise they may simply disappear when the PDF is printed. This check lists text objects inside the TrimBox using white.
White text is not set to knock out (stroked)White objects should be set to knock out, as otherwise they may simply disappear when the PDF is printed. This check lists text objects inside the TrimBox using white for stroke.
Line width is less than minimumLine width less than minimum. These "hairlines" may cause problems when being printed.optional
Image is too close to the edgeImage objects too close to edgesoptional
Syntax problem: Unknown operator in page descriptionThis condition filters for operators that are not defined in the PDF specification and almost always will cause errors.
Text is too close to the edgeText objects too close to edgesoptional
Interactive form field inside page areaDetermines whether interactive form fields are located (completely or partially) within the areas designated by the BleedBox (trim size of a page plus bleed area) or TrimBox (trim size of a page). PDF/X prohibits interactive form fields inside this area.
Effective ink coverage is too highLarger regions on this page have a total area coverage of more than maximum. This can cause problems because a large amount of ink is applied to the paper. For visualizing the respective regions pdfToolbox or the Output Preview of Acrobat with an activated total area coverage check of same threshold can be used. This check includes all page objects including images and checks an effective area of 15 x 15 millimeters.optional
Please check Document sizeThe artwork does not match the size defined for this product.optional
Document is encryptedEven if an encrypted file does not require a password, many applications (incl. Photoshop and InDesign) won't allow one to do anything with the file. In addition, PDF/X and other PDF-based ISO standards prohibit encryption.
Document is damaged and needs repairThe PDF document is damaged. While tFLOW always tries to repair the document when it is opened, there is no guarantee that the document can be processed reliably.

The optional field means that the check could be optionally turned on or off in the UI.