Legacy ImageMagick Discussions Archive

Hi folks...Is it possible to make background color of an image transparent with only the foreground text left out. Then make the foreground text black and then flatten the image to get a white background.

https://www.dropbox.com/s/rv2e6lixnx6hxg6/2694.png?dl=0

Can safely assume that the ...

Actually, I will be processing these images with Java and Tesseract. I cannot stop the workflow to break the image into 2 image. I can resize the image and increase its dpi. Then I need a white background and black text. There can be no varying colors.

Thanks for the reply Fred and snigbo. auto-level was the clincher snigbo. Fred's 2nd approach was close. I have an image of this nature too.
https://www.dropbox.com/s/rv2e6lixnx6hxg6/2694.png?dl=0

can you provide your inputs?

I am on Ubuntu 16.04 and Imagemagick 6.8.9-9 Q16 x86_64

Hi I have this image
https://www.dropbox.com/s/k74wc6id98lzsgu/958.png?dl=0

I have changed the background color to white and foreground to black using:
convert 958.png -colorspace Gray -auto-level -threshold 80% -unsharp 0x5 958WB.png
However my OCR software has trouble digesting it. I have a ...

Sorry ... I should not have uploaded these pics in the public domain...I have deleted them...I have no nefarious reasons except for OCR'ing them. Sorry again...

Hello,
I have a couple of scanned pics of a Passport. I need to remove the background and have the letters left as black to OCR them. How can I accomplish this?

https://www.dropbox.com/s/0tjp7ekuo62owdf/20160509_134927.jpg?dl=0
https://www.dropbox.com/s/5chs9z3obqqzdbv/20160509_135031.jpg?dl=0 ...

The first one with fuzz 30% and gray 40 seems to work the best. Thanks you for your time.

Hello,
I am trying to use Tesseract as OCR for license plates. Here are a few examples:
https://www.dropbox.com/s/1ek33a1vrfa8gbv/LP3.JPG?dl=0
https://www.dropbox.com/s/izkz71t61rs84sj/LP4.jpg?dl=0
https://www.dropbox.com/s/6nahcjnw4o4fo0a/LP5.jpg?dl=0

I need to clear up the background and ...

I upgraded to ImageMagick 6.8.9-9 Q16 x86_64 on my Linux box. It works...thanks a bunch!!

Nope...doesn't work.

My OCR accuracy is about 85% now. I can increase it to 95%-100%. The result of the commands in the previous post is the image below.
https://www.dropbox.com/s/0hmp1rc170l1jog/result.png?dl=0

The desirable result is the following image.
https://www.dropbox.com/s/g73qffwq7bm8357/desirable.jpg?dl=0 ...

worked it out..have to use instead of 50%

Thanks all.

Thank you ...that worked like a charm!! I have a problem I don't understand. I first tried
convert -white-threshold 50% on https://www.dropbox.com/s/pvb5l1itdj73rhd/out.png?dl=0
and I got this result https://www.dropbox.com/s/as3elqdz77417zi/bw.png?dl=0 . The yellow / orange colour is removed ...

Hi..i am new to imagemagick...could you put that as commands? I would really appreciate it.

If it is not possible to fill the numbers...is it possible to extract the numbers? I need this for Optical Character Recognition.