With Interactive PDFs all color gets converted to sRGB. Unless your document also has to get exported for print, assign sRGB as the InDesign doc's RGB profile (Edit>Assign Profiles...) and use an RGB color for the stroke.
Also when you view the PDF in Reader or AcrobatPro, RGB color can be previewed as CMYK output depending on your preferences. In Reader or AcrobatPro make sure your Page Display Overprint Preview is set to Automatic or Never. Or in AcrobatPro you canset the Output Preview>Simulation profile to sRGB. If you view the PDF in a up-to-date browser you should always see sRGB and not a CMYK simulation.
That does seem to do the trick. Many thanks! However the job is print also so may just have to flip profiles between creating pdfs.
Thanks for the help!
However the job is print also so may just have to flip profiles between creating pdfs.
You should be able to use a CMYK mix if you want to. If your stroke was 0|100|100|0 CMYK red, the conversion would be from your document's CMYK assignment to sRGB, which shouldn't produce a color appearance change. If you are using CMYK colors the document's RGB profile assignment wouldn't come into play. I'm guessing the shift you were seeing was because of the Acrobat preference settings and not the conversion to sRGB
That's perfect. Thank you so much for your help!
Is the red frame the indication for a required field? If so, this red frame is preview only and will not print from Acrobat/Reader.
You can color the stroke of the field. In Acrobat, the required red frame will preview, but the applied stroke color of form field will print.