Legacy ImageMagick Discussions Archive

I am trying to do a convert on an image of a document so that it cleans up the noise and lets the text standout for OCR. I am running ImageMagick version 6.9.9-40 locally and get good results. When I run the same call in a Google Function which uses version 6.8.9-9 I get a totally different result. I am not sure if this is due to the version or something else.

How much of a difference is there when running this command on these two versions?

convert bill.jpg -colorspace gray -lat 60x60-2% -define connected-components:mean-color=true -define connected-components:area-threshold=12 -connected-components 4 -depth 2 -compress Group4 bill-mod.jpg

Thanks.

Please post your bill.jpg image to some free hosting service and put the URL here so we can test your command.

Note that -connected-components was only officially available as of 6.8.9.10. So you are one version short. It may have been there in the previous version but unfinished or buggy.

That was exactly it. I removed all reference to connected-components and even though the image has more noise it still is very good to prepare it for OCR.

Thank you!

You can try cleaning small noise spots using -morphology. If you post an example input, perhaps we can suggest another command.