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LightCrafter4500投影仪投影出的图片的长宽比

我把一个1140行912列的图片,图片中间生成一个白色正方形,其余为黑色,传到投影仪,投影出来变为长方形了。我做了对比,宽度应该是没变,长度变了两倍。再试了投影圆,采回来为椭圆。投影仪有设置放大率或梯形较正可以调节吗?