I often need to print out 1:1000 scale drawings to use as a basemap for landscape surveying in the field. We draw directly on to the map so it has to be perfect.
I've found that when I export to pdf it prints out perfectly to scale, but if I try any other image format (png, bmp, tiff, etc.) it prints wrongly (i.e. I measure the scale bar and it's not the right length). I've looked around but I can't see any reason for this in the help.
I can't print directly from the project as these files needs to be emailed to other colleagues for them to print for themselves. I've double checked that I'm not using 'Fit to Page' or any similar other printing related things. So, my question is - is PDF the only possible format for this officially, or are there other formats that work properly?