Some softwares which I've found so far:
Unpaper [cmd-line tool, Cross-Platform]
Post-processing tool for scanned sheets of paper, especially for book pages that have been scanned from previously created photocopies. The main purpose is to make scanned book pages better readable on screen after conversion to PDF. Additionally, unpaper might be useful to ...
Here are the manual steps to achieve that in Photoshop (based in CS6 on OS X):
Open the image (Ctrl-O).
Increase contract by selecting in menu Image -> Auto Tone (Shift-CMD-L).
Optional: Choose Filter -> Lens Correction... (Shift-CMD-R) and straighten the image by using Straighten Tool (A). Basically draw a straight horizontal line in the middle of ...
No silver bullet available. No software really knows the original, only guess. But you can help at the difficult places. At first make
a work copy of your original as separate layer, by Magic Wand select the black (tol=10, anti-alias=ON) and delete it.
a black reference layer to see the result against it when needed
Then one character at the time do the ...
Open a file.
Convert your document to grayscale: Image → Mode → Grayscale.
Select the background color: Select → By Color, click with mouse pointer on the color of the background.
Invert the selected color: Select → Invert.
Copy the selection: Edit → Copy.
Create a new file: File → New.
In the dialog of a new file, in field: Advanced Options ...
This is very easy in Gimp. Just use the bucket tool to fill the background white, and export. Or if you want to go one stage further, then after that, use the select with the same colour tool, press delete (Making sure that your image has an alpha channel) add a new white layer, merge down and export as a jpg, png or whatever.
This is a perfect situation for the smart-blur tool since the text information is high-contrast with respect to the background.
I have a sample below where I applied a mild smart blur just enough to flatten out the grainy nature of the scan.
I then added a layer filled with RGB(128,128,128) and used the noise filter with color on and gaussian distribution. ...
If you are only using Photoshop, These are the steps I took..
First I Changed the image resolution to 300 dpi
Then I went to Menu item Image/Adjust/Invert
Then using my magic wand I selected all of the white in the image
Then in my layers panel, I used that selection to create a mask
While holding the command key, I clicked on the mask icon In the layers ...
Using Photoshop, this is the best way I know to get rid of a background while preserving the integrity of something that has been sketched or drawn and you will get much, much better results than using the magic wand
Select all of your image and copy it in a new channel (the channel created should be named "alpha" automatically)
In the channel, ...
In your case you need to break regularity of your letters to look more like printed raster. I worked with your current image, if you will have higher resolution, you will need to adjust effect settings accordingly.
Copy you letters in a new file
Double the image size (it will add some blur, which is good)
Add effect. Filter -> Pixelate -> Crystallize. Use ...
If you have an Adobe CC account, you can use the Adobe Capture CC app to take a photo and vectorize it. The app is available for iOS and Android devices.
With the app, you can take a photo of a hand drawn sketch on your mobile device, then vectorise it, and send it to Adobe Illustrator (the desktop app) direct from your mobile device.
Of course you don't ...
Since you already have G'MIC - might be an idea to look at the smoothing filters listed under the Repair section in the Plugin. This one is the Smooth (Bilateral) filter. Looks quite promising. However as a side note, I feel removing too much of the texture would detract from the look of a watercolour, making it look like it was painted on glass rather than ...
It would work, but you would have to take the thickness of the strokes into account. You would have to use a pen to draw the body that is 1/3 times the thickness of the pen that you would use to draw the head.
This is what I mean (and proof that I should never go into fashion design). Suppose you use the same pen to draw both sketches. You would end up with ...
For your image I would use Channels.
Go into your channels and notice the red one has the best contrast. Duplicate that channel and then use the Curves to adjust it. At the bottom of the Curves panel you can eyedrop the black point to your text and the white point to the background. Maybe tweak it a little. You get pretty close already. Might have to do the ...
All you need to do is choose Image > Adjustments > Levels and alter the levels within the image.
Simply drag the left triangle (black) to the right to darken the dark areas and then drag the right (white) arrow to the left to lighten the lighter areas on the image.
Viewing the histogram will help. It shows the ramp on the right which is all the data ...
This is just how I would do this, maybe it's not an option for you. This is a technique that goes very quick and will not affect the quality of your black text at all.
I'd isolate the black text using the levels; the textured
background will become white and the black text will remain 100%
black. To achieve this, you'll need to use the white color picker ...
It's most likely because the adjustment layers are accounting for "white" background layer in their calculations. If you want to make sure "what you see is what you get" be sure to clip those adjustment layers (OPT click between layers / ALT for windows)so they only affect the layer with the drawing and nothing else. Hope this helps.
Using the pen tool with a stroke is the correct solution.
You don't need to draw anything with your mouse. Just place anchor points and adjust the curves as needed. With some practice, it doesn't take very long.
Using the (P) and (ctrl+shift+C) keyboard shortcuts are helpful to save time.
Live Trace is helpful for certain tasks, but I wouldn't recommend ...
When I open the PDF in Illustrator, I receive an error that says:
An unknown imaging construct was encountered
This suggests either some kind of file corruption, or perhaps there is some incompatible image format/data in there somewhere. Possibly stuff added by the scanning software?
After clicking OK, the document does finally open, but on further ...
Yes, it's important to descreen a scanned halftone image even though it's going to printed at the same size as the original.
In this answer I will assume that you are printing with offset or a digital printer which uses halftone screen. Many digital printers use stochastic raster and won't have the exact same issues, but likely something similar.
The moiré ...
Something for the dark top areas of your pages:
Start by applying filter smart blur. It doesn't actually make your text more clear, but reduces the graininess of the unwanted noise by combining the particles. Play with the settings:
As said, the smart blur step can be skipped, but there will be more fine grain in the end.
Duplicate the layer. Apply heavy ...
There was a plugin in the GIMP plugin registry that did this. It's archived here now.
Some time ago I translated this to Python and it ran a lot faster.
Here's the result of its application to the image in the original question:
Here's the result of its application to the image in Alan's answer:
Anyway here's the code of the plugin:
from __future__ ...
I tried various mentioned methods incl. free FineThreshold http://www.mehdiplugins.com/english/finethreshold.htm plugin. This plugin produces good results quickly provided that the document is homogenously lighted and the paper itself is also of homogenous quality.
However this was not my case. I experienced that the upper side of every document was more ...
My #1 step to any transfer from traditional media to digital is a tight pen and ink drawing. If not the entire thing, an outline or key line to be painted/colored digitally.
Even though I may sketch in pencil, I always lay a sheet of vellum over the sketch and redraw with pen and ink. Then scan the pen and ink. This provides a much better scan and ...
The scanning we have as an example shows many artifacts which have only little difference in color or brightness. In addition there are heavy JPEG artifacts. Therefore repair tools will have a hard time to separate artifacts from important parts.
For the removal of lines we can try with G'Mic > Repair > Unstrip filter of the Grey's Magic Tools plugin which ...
You can make the new text perfectly match the scanned text,
if you can replace the scanned text also.
It may or may not work for your use case, but I think it's the only way to really do what you ask, "make the added type match the scanned text".
It may be beneficial to scan the drawing at very large dimensions, such as a 600% enlargement. Then trace the enlarged version. This will allow you to trace with more accuracy.
There is a limit to the size of detail Image Trace can see and pick up. If you are at the edge of that, there's not much you can do to force the feature to be more accurate. By ...
To get rid of black noise, best is to look, where it comes from. I found that in yellow areas most of black noise is in green channel. Select area in image, select green channel and adjust curves so the noise is gone.
But in the same time I don't think you should even remove this black noise, because it's a part of cranyon and paper, so it's natural to have ...