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Answer 1:
Using IrfanView (it’s freeware). You can download it here:
https://www.irfanview.com/main_download_engl.htm
Launch IrfanView.
Open the image (File → Open).
Convert the image to grayscale (Image → Convert to Grayscale).
The above instructions were successfully tested with IrfanView 32bit (version 4.51).
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