Before creating PDF files, please create outlines for all the fonts, or attach the TrueType TTF fonts you used in the artwork, as we do not print directly from the PDF files.
Texts in image files (JPG, GIF, BMP, PNG) will not be printed as sharp as other formats with text layers like Corel Draw, Illustrator, Photoshop, PDF, Freehand, Indesign... We suggest you send us your source files with texts layers to us to get better printing result.
If you have used special fonts (or Mac fonts), please send the TrueType TTF font files to us as well, to avoid any font problems, please transfer the texts into vector paths (create outlines). We recommend you compress all your files including a readme.txt with your introductions into a .ZIP or .RAR or .SIT file.