I think parse_edid expects raw binary, and

my $raw_edid = pack 'H*', $registry;

[download]

will work. There's also check_parsed_edid to alert you, even when (very) suspicious results failed to do so :).

Looking at output, fractional dimensions, in mm, indicate something more involved than simply reading size in whole cm (bytes 21-22), I didn't investigate more closely. Further, I didn't investigate neither (sorry), if, after MainWindow-> scaling(X), anywhere where number for size (meaning 'pixels') is to be used, string such as "N.nm" (N.n mm) would result in identical rendering on screen (let's assume no rounding). That's the whole point of it all, to forget about 'pixels', if I'm reading what you say "re-calculate the size in mm" correctly. I agree, I'd probably won't follow this route, neither (not until all displays are 250 dpi or more).

In reply to Re^3: Tk screen and monitor size in mm, DPI and scaling -- Parse::EDID by vr
in thread Tk screen and monitor size in mm, DPI and scaling by Discipulus

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