Prepare your files in the following programmes (formats):

Adobe Photoshop (tiff, eps, jpg, psd, pdf)
Adobe Illustrator (ai, eps)
CorelDraw (cdr)
If your file is in open format, you should enclose typefaces or transform all texts into curves (plot out).
Colours: in CMYK (process colour: cyan, magenta, yellow and key - black)
Image resolution: 300 dpi
Please prepare images larger than 1 m2 in 1:10 ratio (10 % scale).
The image should be set to the final dimensions, that is, to the dimensions of printing (100 % scale).