How do I darken lines, text in a map and dim/white out the grey block stuff for print

[veek]

So I want the red squiggle areas to be whitened/dimmed to save on toner and I want the text and lines/roads highlighted/black/darkened. It's to be printed on a laser Black and White/Grayscale printer.

I tried converting to grayscale and printing but the gray block areas don't print all that great and the text and lines look subdued because 'Yellow Road' looks slightly grey and merges with the block areas.

https://i.imgur.com/VPpa8Vx.png (in grayscale)

What should I do? I tried https://np.reddit.com/r/GIMP/comments/e8...n_old_map/ but it didn't do what I wanted - it darkens the whole image/fiddling with the Levels/Curves

[rich2005]

One way.

I would keep the coloured version until right at the end.

1. Use the colour curve Colors -> Curves and draw the line down to generally darken the image, looking at the roads and text in particular.
2. In the Tools section there is a GEGL Operation dropdown. Choose the Color Warp filter. That lets you choose a colour from the image and alter it. You need to do that for the grey areas, maybe the green park area, buildings.
3. Desaturate (or convert to Greyscale)

I can get that in a 50 second animation. Hope it helps. https://i.imgur.com/0FvgsOG.mp4

[veek]

(04-10-2021, 03:30 PM)rich2005 Wrote: 3. Desaturate (or convert to Greyscale)
I can get that in a 50 second animation. Hope it helps. https://i.imgur.com/0FvgsOG.mp4

Thank you - works brilliantly