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How do I convert this?

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enxio27
Forum Member

How do I convert this?

Post#1 by enxio27 » 27 Feb 2021, 23:57


I want to make this image into a black and white image and then invert it so that the drawings and text are in black on a white background. I also want to clean up the drawing so that the lines are solid, removing all of the stray shadings, etc. What's the best way to go about it? I have a bunch of these from one source (a lace pattern book from the late 1800s).
dmc_lace_1_p_52.png
dmc_lace_1_p_52.png # (382.77 KiB) Viewed 741 times (Thumbnail | Recognize | Sq Tile)
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tim
GL Blogger

Post#2 by tim » 28 Feb 2021, 01:18


I tried but the scan seems to have have artifacts that is very similar color to the design so it's hard to clean up.
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enxio27
Forum Member

Post#3 by enxio27 » 28 Feb 2021, 02:01


tim wrote:
28 Feb 2021, 01:18
I tried but the scan seems to have have artifacts that is very similar color to the design so it's hard to clean up.
I'm coming to the conclusion that I'm going to have to clean it up manually (pixel by pixel where necessary). The good thing is that it's a repeating pattern, so I can do just one section and then repeat it. The patterns in the original book were meant to be removed from the book and used as is. The idea was that you work them in white thread, and the dark background makes the thread easier to see. I wasn't the one who digitized the images (I don't have access to a hard copy of the book), so unfortunately I can't do anything about the scans.
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enxio27
Forum Member

Post#4 by enxio27 » 28 Feb 2021, 02:29


How do I take half an image and copy a mirror image of that half so that it makes a whole?
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tim
GL Blogger

Post#5 by tim » 28 Feb 2021, 02:31


If you're just gonna manually do it. What I would try is scale it up or zoom in really tight then draw paths and stroke paths. I think that would look the best.
To make half an image just select half, copy it, then paste it as new layer and transform-> flip horizontally
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tim
GL Blogger

Post#6 by tim » 28 Feb 2021, 02:37


also the piece can be a 1/6 or it mirrored and copied 3 times.
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tim
GL Blogger

Post#7 by tim » 28 Feb 2021, 03:12


As a sample my work has some minor errors such as a line in the middle of the small circle which can be easily erased.
I just did 1/6 of the pattern as paths.
crazy-pattern.xcf #
(567.01 KiB) Downloaded 22 times
Then stroked it and cleaned it up such as erasing parts of circles.
crazy-pattern.jpg
crazy-pattern.jpg # (32.3 KiB) Viewed 727 times (Thumbnail | Recognize | Sq Tile)
Then flipped it to get 1/3 and copied 3 times to get the full pattern.
crazy-pattern-x6.jpg
crazy-pattern-x6.jpg # (84.6 KiB) Viewed 727 times (Thumbnail | Recognize | Sq Tile)
Hope that gives you idea to work on your good copy.
aka Tin

         

enxio27
Forum Member

Post#8 by enxio27 » 28 Feb 2021, 04:41


How did you get it so clean so fast???? I've been working on it for over three hours and I have only the top section done.

And I'm not sure I understand what you mean by "stroking" or "paths".
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Blighty
Forum Member

Post#9 by Blighty » 28 Feb 2021, 05:32


enxio27 wrote:
28 Feb 2021, 02:01
The good thing is that it's a repeating pattern, so I can do just one section and then repeat it.
I would recommend using vector graphics (Inkscape) for this. It is much easier to use than Gimp paths.

Invert the image in Gimp (Colors > Invert). Then open the image in Inkscape and trace manually. Repeating patterns like this will be very quick in Inkscape. The same method as Tim's, but using Inkscape instead of Gimp.
GIMP Learn rocks...

tim
GL Blogger

Post#10 by tim » 28 Feb 2021, 12:21


Use the path tool to draw paths (tool with icon that looks similar to these :2_10_paths_tool: or :paths:).
Start clicking to draw path points to make lines.
To Start a new stroke point that's not joined with preview point: Shift click
Also you can just click anywhere new to start a point then click and drag that point to desired position.
For Circle I made a selection then Selection -> To Path.
That's pretty all you need to know about paths.
Then once you're all done you can turn visiblity of all paths on and then right click the paths window (like the layers' window except for paths) and merge visible paths, then right click and select stroke paths/vector and it'll pop up with dialog for you to select line thickness and stuff like that.
aka Tin

         


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