Eli Zaretskii <eliz@gnu.org> writes:

>> From: Akib Azmain Turja <akib@disroot.org>
>> Cc: Manuel Giraud <manuel@ledu-giraud.fr>
>> Date: Fri, 31 Mar 2023 22:32:49 +0600
>> 
>> > Akib Azmain Turja <akib@disroot.org> writes:
>> >
>> >> I'm trying to show an image such that it has same height as the text and
>> >> resizes relatively with text scale.  I've achieved this with the 'em'
>> >> unit as described in (elisp)Image Descriptors.  But 1 em seems to be
>> >> pretty smaller than the font size.  How to figure out correct value in
>> >> em unit such that image and the text has correct height?
>> >
>> > Hi,
>> >
>> > FWIW, your example works for me and scales accordingly when I zoom.
>> 
>> But 1 em is pretty smaller than the default font size.  I want to make
>> the image height and the text height same.
>
> Maybe this page will help you:
>
>   https://learn.microsoft.com/en-us/typography/opentype/spec/ttch01
>

Thanks, but I couldn't understand much.  Say the line height is X em,
then how can I figure out that X?

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