invers Software
 
Welcome! Log In Create A New Profile Recent Messages

Advanced

Reducing bitmapped images before vectorising

Posted by Jonas Möller Nielsen 
Jonas Möller Nielsen
Reducing bitmapped images before vectorising
15 years ago
Hi,
I have before gotten the advice to filter my images before I vectorise them with Speedline. But which filter should I use to remove some pixels on my bitmapps?

Jonas
Re: Reducing bitmapped images before vectorising
15 years ago
avatar
If you want to vectorize with Speed~Line, I recommend to convert your images to b&w images. But do not simply click a button and convert e.g. an RGB image to b&w, but convert to Grayscale first. Then play around with FrankLIN in order to find out how to get the best contrast for vectorization.

Speed~Line gets best results from b&w images only - but they don't have to be really b&w, they just have to appear b&w on screen. And furthermore, the zoom factor is important. The higher you zoom, the more edge and border details can be recognized by Speed~Line. (But don't zoom too high, of course.)



Grüße / Greetings / Groetjes / Salutations,
Ulf Dunkel · invers Software
Jonas Möller Nielsen
Re: Reducing bitmapped images before vectorising
15 years ago
Yes, I have converted to BW, though greayscale, but I also need to reduce the edges a bit. After I have run Speedline the black parts in the vectorised output, seem to go togehter in some places. It seems like if the black parts have become slightly bigger than in the original. I have gotten the advice to use a filter on the original, that reduces the black parts slightly, before using Speedline. The quesion is, what filter can I use for this?

Jonas
Re: Reducing bitmapped images before vectorising
15 years ago
Hi Jonas,

You should use the Median filter with the right dial set to somewhere between 51 and 100 to reduce the image in fatness. Between 1 and 50 makes it fatter.
You could play with the left dial: set it to 3 and the effect is small, set it to 10, 100 or more (dependent upon the resolution of the image) and the effect will be dramatic.
The middle dial has little effect in this case.

Happy playing with this incredible filter!

- Paul
Re: Reducing bitmapped images before vectorising
15 years ago
avatar
Jonas:
If you see some "holes" becoming black in the vectorized stuff, then you will have to toggle the vector path direction for this object.

You should check the outline thickness of the created vector objects, too. I use to select them all and set the vector outline to 0 pt TRANSPARENT.



Grüße / Greetings / Groetjes / Salutations,
Ulf Dunkel · invers Software
Re: Reducing bitmapped images before vectorising
15 years ago
avatar
Hi Paul.

I use to set the MEDIAN filter parameters to 5 / 128 / 50 for optimum pixel antialiasing before I start vectorizing with Speed~Line.



Grüße / Greetings / Groetjes / Salutations,
Ulf Dunkel · invers Software
Re: Reducing bitmapped images before vectorising
15 years ago
You could also fatten the image first, so the white spots dissapear (fill up), and then reduce the image with the same amount, so the image has the same fatness as before, but without the white holes.

- Paul

Author:

Your Email:


Subject:


Spam prevention:
Please, enter the code that you see below in the input field. This is for blocking bots that try to post this form automatically. If the code is hard to read, then just try to guess it right. If you enter the wrong code, a new image is created and you get another chance to enter it right.
Message:

Online Users

Guests: 4
Record Number of Users: 2 on April 24, 2019
Record Number of Guests: 126 on November 04, 2019

top top

© 1998–2019 invers Software. All rights reserved. | Privacy