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Convert-to jpg wmf on Linux, resolution issue.

Hello, first of all, I don't speak English very well, I apologize if I make any mistake writing.

I am developing a website that import xlsx files and gets all the images. Some xlsx are generated by a third party software in windows and when images are extracted I get files in wmf format.

For example I want to convert a wmf image (136x77 px) to jpg and I use the command:

libreoffice --headless --convert-to jpg uploads/temp/image.wmf --outdir uploads/converted/

As result I get a jpg image (794x1123 px) with white background and the tiny wmf img centered.

How do I convert to jpg keeping size of original wmf?

The xlsx file has inside many images with different sizes.

Thank you! Best regards, Edu.-