I have some PNG images in my exports that are showing up with thick solid lines instead of thin transparent lines. I need to change the export from PDF/X-1a:2003 to --pdf-profile=pdf/x-1, according to this post on the PrinceXML forum:
https://www.princexml.com/forum/topic/3245/transparent-image-and-page-group-colorspace?p=1#17194
How can this setting be changed without the command line? Is there a line in a config file that specifies PDF output type?