I have an image in Photoshop that is on a white background. I've imported it into Indesign and added type. When exporting it as a PDF to send on to my client, the white background is showing as a light grey. If I open the PDF in photoshop it shows as white and if I output to preview it shows as white, however it also printing out as grey.
I'm using CoatedFogra39 (ISO 12647-2: 2004) but have tried Fogra27, I have tried RGB and CMYK with little difference. I'm on the creative cloud so all is up to date. I have sent both versions to the client and they appear fine on their screen so fairly certain it's a settings thing.