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Selecting only pencil lines in scanned drawing?

Aug 18, 2013, 14:05
Post: #1
Selecting only pencil lines in scanned drawing?
Hi fellas. I'm new to the forum and somewhat new to gimp.
I'm trying to select the pencil lines only from a scanned drawing and lose the white back ground so I can set the drawing only onto other layers. How would I go about doing this?

Thanks!
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Aug 18, 2013, 16:12
Post: #2
RE: Selecting only pencil lines in scanned drawing?
No replies so far?

It all depends on how 'clean' the scanned image is.

A common way of 'losing' a white background is with gimp menu Colors -> Color to Alpha
The default colour is white so you have nothing to do there, the alpha is transparency so you can put the result over another image.

Once you have removed the background, save the image as an .xcf file, this preserves the transparency for later editing.

More info on removing backgrounds
http://gimpforums.com/thread-proper-subj...d-painting

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Aug 18, 2013, 17:19
Post: #3
RE: Selecting only pencil lines in scanned drawing?
When i do Colors to Alpha, I get what looks like almost a negative image.
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Aug 18, 2013, 17:57
Post: #4
RE: Selecting only pencil lines in scanned drawing?
Guessing you have something like this.
The chequer board denotes transparency.

Put a layer under as required. Save as an xcf file to preserve transparency and layers until you are finished.
Export as a png saves transparency but flattens the layers. Export as jpg loses transparency and flattens the layers.

[Image: hqL7esl.jpg]

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Aug 19, 2013, 09:49
Post: #5
RE: Selecting only pencil lines in scanned drawing?
If your paper shows up as a dull gray or off white it can play havoc with a scanned image. So first you might want to choose;

1. Colors --> Desaturate
2. Image --> Mode --> Index... Use B&W
3. Image --> Mode --> RGB

Optional method would be to raise the contrast and lower the brightness.

"Why is there a brightness scale and it doesn't make me any smarter?"

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