TIFF format makes the background transparent To save your image with a transparency in TIFF format, enable the Save transparency checkbox. Once you have confirmed the window, your image will be saved in CMYK colour space in TIFF format with transparency.
You were on the right track. IrfanView sets the background for transparency the same as the viewing color around the image.
You just need to re-open the image with IrfanView after changing the view color to white.
To change the viewing color in Irfanview go to:
Options > Properties/Settings > Viewing > Main window color
If you are using the batch conversion, in the window click "options" in the "Batch conversion settings-output format" and tick the two boxes "save transparent color" (one under "PNG" and the other under "ICO").
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