12-18-2016, 08:54 PM
Attaching the actual image file is better. It seem that you scanned in black/white mode and not in greyscale, which would give more data to process (levels and treshold are only meaningful on greyscale or color).
In your case, a possible processing:
* Filter>Generic>Dilate applied twice will remove most of the random dots
* Filter>Blur>Gaussian blur (5 pixels) will smooth the edges
* Colors>Brightness contrast and increase contrast until the edges become jagged, then back off a bit (about 75)
Slightly differently:
* No Filter>Generic>Dilate
* Filter>Blur>Gaussian blur (10 pixels this time) will smooth the edges
* Colors>Brightness contrast and increase contrast until the edges become jagged, then back off a bit (about 100 this time)
In your case, a possible processing:
* Filter>Generic>Dilate applied twice will remove most of the random dots
* Filter>Blur>Gaussian blur (5 pixels) will smooth the edges
* Colors>Brightness contrast and increase contrast until the edges become jagged, then back off a bit (about 75)
Slightly differently:
* No Filter>Generic>Dilate
* Filter>Blur>Gaussian blur (10 pixels this time) will smooth the edges
* Colors>Brightness contrast and increase contrast until the edges become jagged, then back off a bit (about 100 this time)