09-06-2021, 10:54 AM
(This post was last modified: 09-07-2021, 07:01 AM by rich2005.
Edit Reason: edit
)
Gimp is a bitmap (raster) editor and works in pixels, not real world units even though it can display rulers, sizes, in inches / centimetres etc.
The minimum unit is therefore a pixel and you want that to print at 0.0025 inch. For 100 of those per inch I make it 1 line + 3 spaces.
In Gimp you might make it like this.
Make a small image 4 pixels depth x (say) 4 pixels wide (1 pix wide would do) Use the pencil tool for hard edges, there is a tiny brush in the standard Gimp brush set. Set the width to 1. screenshot: https://i.imgur.com/yZFGGjy.jpg
Ctrl-c copies that to the clipboard.
Create a new image, and start with a A4 template. This is set-up for 300 ppi printing so expand the 'Advanced Options' and increase the ppi to 400. https://i.imgur.com/2D2lzHo.jpg
Now fill that new A4 size image with the little pattern you just made. You can click and drag from from the clipboard pattern (first pattern) https://i.imgur.com/Pab8l5Q.jpg
Printing: Using linux, all depends on the printer. If it imposes margins, then you will get a shrunken A4 smaller than required. The usual fix for this is crop off maybe 5 - 6 mm all round so it prints 100% size. As long as you can get 400 ppi and not 407 ppi which often happens. https://i.imgur.com/IXeKFSr.jpg
There is a whole page on the importance of printing resolutions here: https://www.gimp-forum.net/Thread-Image-size-in-Gimp
Edit: Oops, Not paying attention. Vertical lines required. Exactly the same but with a vertical 1 pixel line in the pattern. Make sure you use the pencil tool.
The minimum unit is therefore a pixel and you want that to print at 0.0025 inch. For 100 of those per inch I make it 1 line + 3 spaces.
In Gimp you might make it like this.
Make a small image 4 pixels depth x (say) 4 pixels wide (1 pix wide would do) Use the pencil tool for hard edges, there is a tiny brush in the standard Gimp brush set. Set the width to 1. screenshot: https://i.imgur.com/yZFGGjy.jpg
Ctrl-c copies that to the clipboard.
Create a new image, and start with a A4 template. This is set-up for 300 ppi printing so expand the 'Advanced Options' and increase the ppi to 400. https://i.imgur.com/2D2lzHo.jpg
Now fill that new A4 size image with the little pattern you just made. You can click and drag from from the clipboard pattern (first pattern) https://i.imgur.com/Pab8l5Q.jpg
Printing: Using linux, all depends on the printer. If it imposes margins, then you will get a shrunken A4 smaller than required. The usual fix for this is crop off maybe 5 - 6 mm all round so it prints 100% size. As long as you can get 400 ppi and not 407 ppi which often happens. https://i.imgur.com/IXeKFSr.jpg
There is a whole page on the importance of printing resolutions here: https://www.gimp-forum.net/Thread-Image-size-in-Gimp
Edit: Oops, Not paying attention. Vertical lines required. Exactly the same but with a vertical 1 pixel line in the pattern. Make sure you use the pencil tool.