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Blocky lines

Feb 12, 2014, 09:26
Post: #1
Blocky lines
Hello,

I'm both new here and somewhat new to Gimp.

I'm going through a scanned circuit diagram and all the lines look like this,

[Image: blockyness.jpg]


Is there any way to rectify or clean this up?

Mark
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Feb 12, 2014, 11:12
Post: #2
RE: Blocky lines
If you want a semi-automatic way.
(fuzzy selections might be out of the question as the scan is pixelated)

semi-auto=========================
Filters > Distorts > Emboss
()Bumpmap
-Azimuth: 0.00
-Elevation: 85.26
-Depth: 14
click ok

Follow up (to clean up grey spots) with
Colors > Brightness-Contrast
- Contrast: 55 or over.

=============Manual way
-make a new transparent layer (this will be your tracing paper)
Pencil using the pencil tool, trace over the lines
-Adjust the size: to the width of the line, then click once for the start of the line, hold shift & click at the end of the line to draw straight lines.
More info on drawing a straight line: http://www.gimp.org/tutorials/Straight_Line/

"In order to succeed, your desire for success should be greater than fear of failure." BC
[Image: 29uocaf.png]
iFS007 tut vids on YT ~ auto color B&W landscape tut
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Feb 12, 2014, 12:18
Post: #3
RE: Blocky lines
I don't have the original document, the images I'm working from are extracted from a pdf.

This is probably the worst of the images.

Any help would be most appreciated.

It's the schematic of an amp that I'm currently rebuilding. It's controlled by a very old and very failed custom IC.

Thanks, Mark Smile


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Feb 12, 2014, 12:53 (This post was last modified: Feb 12, 2014 12:56 by fluffybunny2.)
Post: #4
RE: Blocky lines
(Feb 12, 2014 12:18)mrme01 Wrote:  I don't have the original document, the images I'm working from are extracted from a pdf.

This is probably the worst of the images.

Any help would be most appreciated.

It's the schematic of an amp that I'm currently rebuilding. It's controlled by a very old and very failed custom IC.

Thanks, Mark Smile
Here is the a link to the pdf document, unfortunately the quality is brilliant either though Sad
But being able to zoom in on the pdf helps...
http://diagramas.diagramasde.com/audio/-...20s.m..pdf
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Feb 12, 2014, 13:07
Post: #5
RE: Blocky lines
(Feb 12, 2014 12:53)fluffybunny2 Wrote:  
(Feb 12, 2014 12:18)mrme01 Wrote:  I don't have the original document, the images I'm working from are extracted from a pdf.

This is probably the worst of the images.

Any help would be most appreciated.

It's the schematic of an amp that I'm currently rebuilding. It's controlled by a very old and very failed custom IC.

Thanks, Mark Smile
Here is the a link to the pdf document, unfortunately the quality is brilliant either though Sad
But being able to zoom in on the pdf helps...
http://diagramas.diagramasde.com/audio/-...20s.m..pdf

The one I obtained is a different filesize, a few 100K bigger.
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Feb 12, 2014, 13:19
Post: #6
RE: Blocky lines
(Feb 12, 2014 13:13)ofnuts Wrote:  You can make it a bit more readable (without reconstructing the missing lines) with:

- Colors/Threshold (default values, this is just to remove the gray smear due to second-generation JPEG compression)
- Light blurring: "Filters/Blur/Gaussian blur", radius: 3px
- Sharpening: "Filter/Enhance/Unsharp mask": 1.0/1.0/10.

That worked really well, thank you!

Is there anything that can be done about the lines, besides redrawing them?

Mark
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Feb 14, 2014, 09:31
Post: #7
RE: Blocky lines
(Feb 12, 2014 13:19)mrme01 Wrote:  
(Feb 12, 2014 13:13)ofnuts Wrote:  You can make it a bit more readable (without reconstructing the missing lines) with:

- Colors/Threshold (default values, this is just to remove the gray smear due to second-generation JPEG compression)
- Light blurring: "Filters/Blur/Gaussian blur", radius: 3px
- Sharpening: "Filter/Enhance/Unsharp mask": 1.0/1.0/10.

That worked really well, thank you!

Is there anything that can be done about the lines, besides redrawing them?

Mark

The full page sample you posted looks ok at a smaller zoom level (not 100% zoom)

What you could try is zooming out a little from 100% of the circuit image until the lines blend well together. Then do a screenshot & paste the screenshot into gimp and crop out the extra screen around the picture.
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