The documentation about saving TIFF images says that

Valid compression methods are: None, "tiff_ccitt", "group3", "group4", "tiff_jpeg", "tiff_adobe_deflate", "tiff_thunderscan", "tiff_deflate", "tiff_sgilog", "tiff_sgilog24", "tiff_raw_16"

However, I can create LZW-compressed TIFFs by passing a "tiff_lzw" value:

image.save("image.tif", compression="tiff_lzw")

Since LZW is a commonly used compression method, I think it would be good to clarify what's going on here:

• Does it accidentally happen to work but with problems I'm not seeing?
• Is the support dependent on the user's software configuration?
• Is the value "tiff_lzw" officially supported and the fact that it isn't in the documentation is an oversight?