Posted by flywire on Oct 08, 2023; 11:55pm
URL: https://forum.librecad.org/Quality-of-Export-as-Image-tp5723782p5723645.html

I'm interested in displaying the image outdoors on a phone. Images on a white background are washed out and hard to see so they work best with a black background, interestingly the same as the default GUI.

Using: test.dxf with Drawing Units in Meters.





I stumbled across this trick of resetting drawing units from Meter to Centremetre which makes the display easier to see without changing all the layer settings:



Export as image is flakey (ie it might not work), and it drops the line thickness so it's not really an image like a screendump is.

dellus wrote

Export to pdf is the right way to to print somewhere else.

...which I understand only prints on a white background.

test-export.pdf



The circle is hard enough to see in the office let alone in the sun on a phone.

Save pdf as png, I used https://www.pdfill.com/pdf_tools_free.html 10. Convert PDF to Images at 300dpi: test-export-pdf.png



Unfortunately, in this test most of the dimension detail is lost.

To quickly convert the background to black and the black to white I just used paint.net Adjustments, Invert Colours.



This wasn't the right tool, I only really wanted to invert the black and white to print on a black background, not all the colors.

Better results could be produced in a production system with other software and pixel density. The best image was from resetting the units and doing a screendump. It would be good if LibreCad Export to pdf supported a black background, and optionally allowed construction layers and the grid to be shown.