PDF/A error
PDF/A error: a transfer function is present in the graphics state
Transfer functions, halftones and other device-level rendering controls are restricted in PDF/A-1b. What triggers the check and how to clear it.
The graphics state carries a transfer function — a device-level remapping of colour values that PDF/A does not permit, because its effect depends on the rendering device. Remove it at export, or convert the document, which strips it.
ISO 19005-1 clause 6.2Transparency
The Transparency check group covers 6.2.8 transfer functions, 6.4 soft masks/blend modes/alpha. The exact sub-clause is reported on the issue itself when the validator raises it.
What causes it
- Print-oriented export presets that set a transfer function for dot gain compensation.
- A file that passed through a prepress workflow which added device-level rendering controls.
- Legacy PostScript conversion carrying its rendering settings forward into the PDF.
How to fix it
- Export without prepress or device-calibration settings, or explicitly clear the transfer function in the export preset.
- Convert the document — removing a transfer function is a safe, semantics-preserving fix, so conversion resolves it rather than reporting it as residual.
Frequently asked
Will removing it change how the document prints?
On the device it was calibrated for, possibly. That is the point of the restriction: the calibration is an instruction to one device, and an archival document is not allowed to depend on one.
Check your own document
The validator runs the same engine in your browser and names every failing check. The file is never uploaded.