PDF to PDF/A Keeps CMYK Transparency in Acrobat

PDF to PDF/A files with CMYK transparency now open in Adobe Acrobat without errors and with all their content. Before, Acrobat reported an invalid transparency group and left that content blank.

Fixes

• PDF to PDF/A - PDFs with CMYK transparency, as InDesign often exports them, converted to PDF/A-2 or later showed "Invalid Transparency Group" in Acrobat. The affected content, such as a full-page drawing, was missing. Such content now blends in RGB, so Acrobat shows it. Colors in those areas can shift slightly.
• PDF/A-1 output was not affected, because PDF/A-1 allows no transparency.

Try it out

• PDF to PDF/A
• API sandbox: pdf-to-pdfa