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[ft] Different font appearance depending on matrix

From: Jan Engelhardt
Subject: [ft] Different font appearance depending on matrix
Date: Wed, 18 Feb 2015 23:54:37 +0100 (CET)
User-agent: Alpine 2.11 (LSU 23 2013-08-11)

Depending on how one chooses font scaling, the result looks different.
As a baseline, I am using

[1] xterm -fa 'DejaVu Sans Mono:size=26:matrix=0.85 0 0 1'

this can be rewritten to

[2] xterm -fa 'DejaVu Sans Mono:size=13:matrix=1.7 0 0 2'
[3] xterm -fa 'DejaVu Sans Mono:size=7.5:matrix=3.4 0 0 4'
[4] xterm -fa 'DejaVu Sans Mono:size=52:matrix=0.425 0 0 0.5'

[5] xterm -fa 'DejaVu Sans Mono:size=22.1:matrix=1 0 0 1.17647'

The font looks slightly different for these four configurations (and
in case of [3] even causes a different window size) - screenshot at .

What may be the reason behind the different renderings?
There might be rounding erros in cases like [5], but [1]/[2]?

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