How to make a straight line in millimeters ?

Oby4455 · **Joined:** Apr 05, 2020 **Posts:** 2

GIMP Version: 2.10.14
Operating System: Windows
OS Version: Windows 10
GIMP Experience: Basic Level

Hi everyone,

I am reproducing an old manual. I was successful in making a rectangle with rounded corners with a line thickness in millimeters. I can't find how to do this with a straight line ?? I can choose the thickness using different tools like a pencil or the paintbrush but the thickness is in px and I can't find a way to change the units.

Is this possible ?

Thank you in advance for your help!

JimmyMarco · **Joined:** Apr 05, 2020 **Posts:** 41

Hello Oby4455,

I have searched a way to set line thickness in millimeter... and i don't find... sorry.

You can find how much pixels used for one millimeter in the image resolution you are working on.
For exemple in :
- Menu Image -> Image scale and size
- Choose Resolution X ... 3,9370 ... in pixels/mm

You can round to 4 pixels/mm if you want.

Good design.

@+++

Oby4455 · **Joined:** Apr 05, 2020 **Posts:** 2

Thank you anyway. I find a work around. I drawed the rectangle on a separate layer and then cut the parts I do not need to make a straight line. It works well for what I need to do but I wish I knew a better way.

rich2005 · **Joined:** Mar 04, 2011 **Posts:** 2615

Quote:

I am reproducing an old manual. .... a line thickness in millimeters. I can't find how to do this with a straight line ?

To put it mildly, Gimp is not the best tool for any sort of technical drawing. Inkscape is a bit better.

Example: 2mm line width. Draw your straight line using the path tool, stroke the path.

Attachment:

2mm.jpg [ 74.16 KiB | Viewed 4504 times ]