图表对于cairo-renderer位图来说太大了

我试图使用pyreverse为项目源代码生成UML图像.当我运行pyreverse命令并指定生成png图像时,它会运行,然后一段时间后,它会显示:

dot: graph is too large for cairo-renderer bitmaps. Scaling by 0.271394 to fit
dot: graph is too large for cairo-renderer bitmaps. Scaling by 0.333083 to fit

然后,如果我打开任一图像,文本是不可读的,因为它已缩放.有没有办法不缩放,让图像大尺寸？

谢谢