有关格式修改的，Optial Engineering的图的格式要求。求指导!
下面这段神马意思啊？
Set the graphic for 600 dpi resolution for line art, 264 dpi for halftones, and 600 dpi for combinations (line art + halftone). Save line art as black/white bitmap; not grayscale. Save halftones and combinations as grayscale, not black/white bitmap. Set the bounding box to image to avoid excess white space around the image.]
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不清楚
