I designed an album with inDesign and exported as a high res pdf to be uploaded to Graphi. When I open the pdf the backgrounds of the pages where I used black in Indesign are looking gray on the PDF. I followed all the color instructions and export instruction from Graphi. Anyone else have this problem or what I'm doing wrong?
Will this print gray or do I have a setting wrong in Acrobat?

What setting do you have on in Acrobat under Preferences/Color Management?

Be sure that your black in Indesign is set to RGB black. The default is CMYK black, which turns to a dark gray when the file is converted to RGB. You will need to go through your entire document and check that every element (fills and strokes) are set to an RGB color mix. Then, export the file again per Graphi's pdf export specs, and the black should be fixed. Also, if you have used the transperancy feature in InDesign, be sure you set the Transperancy Flattener settings to RGB as well.