MacOS support only?

[Martin Waller]

Hi,

I've recently posed a question on the GitHub forum:

https://github.com/tesseract-ocr/tesseract/issues/3647

It concerns a tif image with a white background being turned into a PDF with a black background. I supplied the tif in question and was told that it shows up black on MacOS and the case closed seemingly without any attempt to try it on a PC.

Is Tesseract support limited to the MacOS platform?

Martin

[Zdenko Podobny]

No, tesseract has support for o lot of platforms including Windows, Linux, and Mac.

IMO the "problem" is in your tiff file. Tesseract uses leptonica for handling images, so the best place is to ask at  https://github.com/DanBloomberg/leptonica/issues why there is inverted output (or why some tools on Windows are interpreting it as white while other tools (including tesseract on Windows) on Mac as black.

Zdenko

št 18. 11. 2021 o 15:37 Martin Waller <ocga...@gmail.com> napísal(a):

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[Ger Hobbelt]

(quick reply without having looked at your file)

chances are, when different applications render an image with different backgrounds, that the image is encoded as transparent.

Use imagemagick or other tools to postprocess your image to ensure any alpha channel (transparency) is removed before feeding it to tesseract.

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[Martin Waller]

Hi Guys,

Many thanks for the replies. Digging around I've found instances of the image showing as white, showing as white with a transparent border top and left, and as black! There is something odd about the image!

Martin