[NTG-context] Embedding of ICC profiles and preflight

Hello, I am trying to embed a profile but it doesn't work. I am using: \setupbackend [format=PDF/X-1a:2001, intent=Coated FOGRA39 (ISO 12647-2:2004), file=CoatedFOGRA39.icc, option=always ] Acrobat Preflight says it has not profile embedded. Am I doing something wrong? The next thing is I am using text smaller than 12pt and nothing helps me to prevent ConTeXt to: 1) overprint the GRAY text (\setupcolors allows just to set cmyk-gray/rgb); 2) knockout text smaller than 12pt, what is not allowed in a good pdf file. Any solutions highly appreciated, Jan Hejzl