Hans, according to Boris Doubrov (one of the developers of the veraPDF parser for PDF/A validation) the subtype of the /OutputIntent dictionary for all PDF/A intents should be GTS_PDFA1 (no GTS_PDFA2 or GTS_PDFA3).
Here is his reply for reference: https://github.com/veraPDF/veraPDF-parser/issues/317#issuecomment-338613962. The attached patch fixes the issue. I have tried it myself and it solves the problems with color space profiles. Could you apply it to ConTeXt? Many thanks for your help, Pablo -- http://www.ousia.tk
--- mkiv/lpdf-fmt.lua 2017-10-19 13:54:58.000000000 +0200 +++ lpdf-fmt.lua 2017-10-23 18:18:10.528400281 +0200 @@ -355,7 +355,7 @@ pdf_version = 1.7, format_name = "pdf/a-2a", xmp_file = "lpdf-pda.xml", - gts_flag = "GTS_PDFA2", + gts_flag = "GTS_PDFA1", gray_scale = true, cmyk_colors = true, rgb_colors = true, @@ -379,7 +379,7 @@ pdf_version = 1.7, format_name = "pdf/a-3a", xmp_file = "lpdf-pda.xml", - gts_flag = "GTS_PDFA3", + gts_flag = "GTS_PDFA1", gray_scale = true, cmyk_colors = true, rgb_colors = true,
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