If you are sending print-ready artwork, send it as a PDF in RGB format.
Images within the PDF should be saved as a JPEG at 300 dpi resolution and submitted as the actual size required or LARGER.
* * * Enlarging a small JPEG will create jagged pixelated edges and blurriness, * * * * * * * * so for optimal print quality, ensure the original photo is high quality. * * * * *