Making images with 300 dpi

[rich2005]

When you export from LibreCAD it sets a canvas size in pixels depending on the drawing and the export resolution.
Change the setting to the size in pixels that you need in Gimp. This example the size changed to Gimp A4 @ 300 ppi 2480 x 3508 pix.

   

Then in Gimp use Image -> Print Size and change the 96 ppi to 300 ppi. This is an internal setting used by the printer and does not scale the image. The size in pixels remains the same.