Eu tentei os mesmos comandos e obtive os mesmos resultados.
$ printf "\u2318" | convert -size 100x100 label:@- \
-font unifont-Medium command.png
Mudar para o unicode da letra G funciona bem:
$ printf "\u0047" | convert -size 100x100 label:@- \
-font unifont-Medium command.png
Eu postaria essa pergunta no site do ImageMagick Discourse para ver por que isso está ocorrendo. Posso ajudar se você não souber como fazer isso ou prosseguir.
Conversão de depuração
Você pode adicionar a -debug annotate
opção para ver o que convert
está acontecendo .
Exemplo
$ printf "\u2318" | convert -size 100x100 label:@- -font unifont-Medium -pointsize 40 -debug annotate command.png
2014-04-10T09:37:04-04:00 0:00.020 0.010u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 12
2014-04-10T09:37:04-04:00 0:00.020 0.010u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 6.375; height: 14; ascent: 11; descent: -3; max advance: 24; bounds: 0.625,0 6.78125,8; origin: 7,0; pixels per em: 12,12; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.010u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 12
2014-04-10T09:37:04-04:00 0:00.020 0.010u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 6.375; height: 14; ascent: 11; descent: -3; max advance: 24; bounds: 0.625,0 6.78125,8; origin: 7,0; pixels per em: 12,12; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.010u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 24
2014-04-10T09:37:04-04:00 0:00.020 0.010u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 12.75; height: 28; ascent: 22; descent: -5; max advance: 48; bounds: 1.25,0 13.5781,18; origin: 15,0; pixels per em: 24,24; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.010u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 48
2014-04-10T09:37:04-04:00 0:00.020 0.010u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 25.5156; height: 55; ascent: 43; descent: -10; max advance: 96; bounds: 2.48438,0 27.1406,35.5; origin: 29,0; pixels per em: 48,48; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.010u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 96
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 53.0312; height: 110; ascent: 87; descent: -20; max advance: 192; bounds: 4.96875,0 54.2812,70; origin: 59,0; pixels per em: 96,96; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 96
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 53.0312; height: 110; ascent: 87; descent: -20; max advance: 192; bounds: 4.96875,0 54.2812,70; origin: 59,0; pixels per em: 96,96; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 95
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 52.0781; height: 109; ascent: 86; descent: -20; max advance: 190; bounds: 4.92188,0 53.7188,70; origin: 58,0; pixels per em: 95,95; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 94
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 51.1406; height: 108; ascent: 85; descent: -20; max advance: 188; bounds: 4.85938,0 53.1562,68; origin: 57,0; pixels per em: 94,94; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 93
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 51.1875; height: 107; ascent: 84; descent: -20; max advance: 186; bounds: 4.8125,0 52.5781,67; origin: 57,0; pixels per em: 93,93; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 92
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 50.2344; height: 106; ascent: 83; descent: -19; max advance: 184; bounds: 4.76562,0 52.0156,67; origin: 56,0; pixels per em: 92,92; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.020 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 91
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 50.2969; height: 105; ascent: 82; descent: -19; max advance: 182; bounds: 4.70312,0 51.4531,65.4688; origin: 56,0; pixels per em: 91,91; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 90
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 49.3438; height: 103; ascent: 81; descent: -19; max advance: 180; bounds: 4.65625,0 50.8906,65.4688; origin: 55,0; pixels per em: 90,90; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 89
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 48.3906; height: 102; ascent: 81; descent: -19; max advance: 178; bounds: 4.60938,0 50.3281,64; origin: 54,0; pixels per em: 89,89; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 88
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 48.4375; height: 101; ascent: 80; descent: -19; max advance: 176; bounds: 4.5625,0 49.7656,64; origin: 54,0; pixels per em: 88,88; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 87
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 47.5; height: 100; ascent: 79; descent: -18; max advance: 174; bounds: 4.5,0 49.1875,63; origin: 53,0; pixels per em: 87,87; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 86
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 47.5469; height: 99; ascent: 78; descent: -18; max advance: 172; bounds: 4.45312,0 48.625,63; origin: 53,0; pixels per em: 86,86; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 86
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/GetTypeMetrics/798/Annotate
Metrics: text: ⌘; width: 47.5469; height: 99; ascent: 78; descent: -18; max advance: 172; bounds: 4.45312,0 48.625,63; origin: 53,0; pixels per em: 86,86; underline position: -5.0625; underline thickness: 3.35938
2014-04-10T09:37:04-04:00 0:00.030 0.020u 6.7.8 Annotate convert[16619]: annotate.c/RenderFreetype/1220/Annotate
Font /usr/share/fonts/msttcorefonts/arialbd.ttf; font-encoding none; text-encoding none; pointsize 86
ATUALIZAÇÃO # 1 - Depurando ainda mais
Esta questão estava me irritando, então acho que finalmente entendi. O problema é a seleção da fonte e não é possível exibir esse glifo específico.
Primeiro, você pode usar este comando para ver em quais fontes você está disponível convert
. Então, vamos começar por aí.
$ convert -list font | head -8
Path: /etc/ImageMagick/type-ghostscript.xml
Font: AvantGarde-Book
family: AvantGarde
style: Normal
stretch: Normal
weight: 400
glyphs: /usr/share/fonts/default/Type1/a010013l.pfb
...
O exemplo acima mostra uma amostra, cada fonte tem linhas semelhantes às acima. Aliás, executar este comando mostra que temos várias centenas de fontes:
$ convert -list font | grep Font | wc -l
262
Em seguida, executaremos a tarefa de codificar nosso personagem, \u2318
usando todas as fontes que temos. Isso parece complicado, mas é bastante trivial com alguns liners bem pensados via Bash.
$ for i in $(convert -list font | grep Font | awk '{print $2}'); \
do convert -font $i -pointsize 36 label:⌘ ${i}.gif;done
Esse trecho usará um loop for para percorrer cada fonte, executando uma versão modificada do seu convert
comando.
Agora, examinamos os resultados. Muitas das fontes não podem exibir esse glifo específico, mas várias podem, o que parece indicar que não é necessariamente um bug no ImageMagick, mas uma limitação das próprias fontes. Aqui está uma lista das fontes que eu tinha que poderiam exibir esse glifo.
- DejaVu-Sans-Bold
- DejaVu-Sans-Bold-Oblique
- DejaVu-Sans-Book
- DejaVu-Sans-Condensed-Negrito
- DejaVu-Sans-Condensed-Bold-Oblique
- DejaVu-Sans-Condensed
- DejaVu-Sans-Condensed-Oblique
- DejaVu-Sans-Mono-Negrito
- DejaVu-Sans-Mono-Negrito-Oblíquo
- Livro DejaVu-Sans-Mono
- DejaVu-Sans-Mono-Oblique
- DejaVu-Sans-Oblique
- DejaVu-Serif-Bold
- DejaVu-Serif-Negrito-Itálico
- DejaVu-Serif-Book
- DejaVu-Serif-Condensed-Negrito
- DejaVu-Serif-Condensed-Bold-Italic
- DejaVu-Serif-Condensed
- DejaVu-Serif-Condensed-Italic
- DejaVu-Serif-Italic
- FreeMono-Regular
- FreeSerif-Regular
- STIX-Math-Regular
- STIX-Regular
- VL-gótico-regular
Examinei visualmente todos os ~ 260 .gif
arquivos resultantes para determinar quais funcionavam e quais não funcionavam. Aqui está uma amostra de alguns dos que funcionaram apenas para que você possa vê-los.
Referências