Legacy ImageMagick Discussions Archive

Oh wow, the result is impressive!
Can I ask what kind of perspective transformation will make the vertical line vertical? Sorry I'm new to image processing.

I have an image here:
https://www.dropbox.com/s/yis42coyq00nxl2/bloodtest8.jpg?dl=0

In order to get a good result from OCR I need to increase the contrast of this image to make the text in it stand out from the background.
I tried 'convert -brightness-contrast 0x50 bloodtest8.jpg bloodtest8_bright ...

Thanks for your reply.
May I ask why the lines here are hard to remove? Is it because they are skewed? The result in the link is so cool.

Suppose I have an image like this one:
https://www.dropbox.com/s/7e8xmjt5u04ushy/labtest4.jpg?dl=0
How do I remove the vertical and horizontal lines in the image?

I found a useful answer here but don't know what adjustment to make to deal with my image:
https://stackoverflow.com/questions/53955328 ...