Legacy ImageMagick Discussions Archive

i use the command
convert aaaa.bmp -colorspace HCL -channel g -separate +channel -threshold 10% img.bmp

And got 3 pictures : img-0.bmp | img-1.bmp |img-2.bmp.
http://image.prntscr.com/image/b7f8411c09614ab4bcb54597c1665cc5.png
Figure img-1.bmp is great for character recognition

If I use in a ...

I used part of your command
convert print1.bmp -colorspace HCL -channel g -separate +channel -threshold 10%% -negate print1.bmp
And got 3 figures. (print1-0.bmp print1-1.bmp print1-2.bmp)
Figure print1-1.bmp is perfect for my purpose.

Now 90% of my problem is solved. thank you so much.

Let's go ...

Try this Unix syntax:

convert 9a6c443dfa76445fa95158948cc4e9bd.png \
\( -clone 0 -colorspace HCL -channel g -separate +channel -threshold 40% \) \
-alpha off -compose copy_opacity -composite result.png


Please always provide your IM version and platform, since syntax may differ.

I´m testing ...

Could you help me by putting the code?

I got good medium results using the code.
convert out.bmp +dither -posterize 2 out1.bmp

http://image.prntscr.com/image/339ba2df427645799c79b1ffd7935fc0.png

However, in some cases, the following problem occurs:
http://image.prntscr.com/image ...

Note the colors of the letter S. I have a variety of colors.
The fact is that the font seems to be the same and the background is in variations of gray and black

http://image.prntscr.com/image/484286bccefb48fdbb5251a3393f7bad.png
http://image.prntscr.com/image/bc9270b77a5843b1ae43e23fbb18890d ...

I did some tests, these comands solve 60% of the problems.

To solve it all I need something that does the following:
1) transform all shades of any color (not just green) in the actual color
Example: light red, dark red are transformed into red
2) all shades of gray are transformed into white (or ...

Thank you so much for your cooperation :D :D :D . I did the test with 4 identical texts and with different backgrounds.
Has improved a bit but is not yet readable

I was thinking of another solution.
It would be possible to normalize the colors of an image.
example:
An image has pixels: dark green ...

For example, this finds the difference between two images. Where the difference is not zero (black), it changes the pixels to white.
convert in1.png in2.png -compose Difference -composite -fill White +opaque Black out.png


Look the images
http://image.prntscr.com/image ...

Thank you for answering. Congratulations on the site. He helped me a lot.

I have a question.
1. ok.
2. ok.
3. Sorry, I do not know how to do this. Could you help me with an imagemagick code?

Note: It is possible to obtain 2 or more images with the same text but with different background

I have some movies with embedded subtitles.
I'm doing a paper that tries to extract the text from these captions.

Examples:
http://image.prntscr.com/image/70511600e95c4950ae637fd5b96b9cd3.jpg
Font colors may change

I would like a result like that.
http://image.prntscr.com/image ...