We need to submit a file 6.125" x 4.125" at 300dpi to our printer. This has never been a problem before. Photoshop changes our custom document size from the entered dimensions to 6.127" x 4.127". This is a problem. Anyone else having this issue? Adobe's answer was to change the resolution to 300.1 dpi which seems like a weird hack. We have tried to unclick the proportion constrain link and you still can't get the exact size.
Unavoidable. An image consists of pixels. Photoshop is rounding to the nearest whole pixel.