artwork ,路过的指点一下

第一次生成光绘文件

artwork    .art 文件的尺寸和板子的尺寸应该是一样的吗?

WARNING: database resolution exceeds the resolution of the
      output coordinates (see FORMAT in parameter file).
      Some roundoff of coordinates may occur unless the number
      of decimal places in the output file is increased.

WARNING: Photoplot window exceeds film size (2400.00 x 1600.00)
          stated in parameter file.

 WARNING: Photoplot window exceeds film size (2400.00 x 1600.00)
          stated in parameter file.

DEVICE-TYPE           GERBER6X00
OUTPUT-UNITS          INCHES
FILM-SIZE             240000 160000
FORMAT                5.4

如果把fomat 改成5.5就没有第一个警告,但是后两个还有,并且.art的尺寸

是真实的10倍......

到底该怎么设置啊?大家指点！