Render tune title, subtitle and composer in Latex/HTML and not in the image. This way the titles remains a constant size even if the image needs to be scaled. And we have that text appearance under our control. I can't find a way of switching off the tune title in abcm2ps, and have worked around by setting the title format to Y0. Y is not a defined ABC header and is not found in any Dottes tune.

X:1
T:Salmon Tails
% Nottingham Music Database
S:via PR
M:4/4
L:1/4
Q:160
K:G
B/A/ | "G"GE DE|G2 G3/2A/2| Bd AB/2A/2|"D"GE DE|"G"GE DE|"C" G2 G3/2A/2|\
"G"Bd "D7"AB/2A/2|"G"G2 G :|
"G"Bd d2|"C"ce e2|"G"dB AB/2A/2|"D"GE D2|"G"Bd d2|"C"ce e3/2f/2|"G"gf ed\
|"D7"ef "G"g2|
"G"Bd d2|"C"ce e2|"G"dB AB/2A/2|"D"GE D2|"G"GE DE|"Em" G2 G3/2A/2|\
"G"Bd "D7"AB/2A/2|"G"G2 G2||