我已经阅读了大量有关将字体（使用ghostscript）从PDF转换为图像时字体问题的stackoverflow问题。
因为您没有嵌入字体，所以ghostscript会尝试在您的系统中找到替代品并尽可能地渲染。
但我无法理解为什么我的Mac OS X预览渲染完美PDF和后记不能。
gs -sFONTPATH=/Library/Fonts -sDEVICE=pngalpha -o file-%03d.png -r144 my.pdf
我甚至告诉gs字体在哪里。
这是输出。
$ pdffonts cv18.pdf
Fontconfig warning: "/usr/local/etc/fonts/fonts.conf", line 86: unknown element "blank"
name type encoding emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
CenturyGothic,Bold TrueType WinAnsi no no no 13 0
CenturyGothic TrueType WinAnsi no no no 14 0
CourierNew TrueType WinAnsi no no no 15 0
Arial TrueType WinAnsi no no no 16 0
AYTOPC+Wingdings TrueType WinAnsi yes yes no 17 0
TimesNewRoman TrueType WinAnsi no no no 18 0
CenturyGothic,Italic TrueType WinAnsi no no no 24 0
$ gs -sDEVICE=pngalpha -o file-%03d.png -r300 cv18.pdf
GPL Ghostscript 9.26 (2018-11-20)
Copyright (C) 2018 Artifex Software, Inc. All rights reserved.
This software comes with NO WARRANTY: see the file PUBLIC for details.
Processing pages 1 through 2.
Page 1
Querying operating system for font files...
Substituting font NewCenturySchlbk-Bold for CenturyGothic,Bold.
Loading C059-Bold font from /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/C059-Bold... 4357236 2918185 2219472 869812 4 done.
Substituting font NewCenturySchlbk-Roman for CenturyGothic.
Loading C059-Roman font from /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/C059-Roman... 4504148 3145674 2313416 951449 4 done.
Substituting font Courier for CourierNew.
Loading NimbusMonoPS-Regular font from /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/NimbusMonoPS-Regular... 4731860 3382093 2548760 1140366 4 done.
Can't find (or can't open) font file /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/ArialMT.
Can't find (or can't open) font file ArialMT.
Can't find (or can't open) font file /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/ArialMT.
Can't find (or can't open) font file ArialMT.
Didn't find this font on the system!
Substituting font Helvetica for ArialMT.
Loading NimbusSans-Regular font from /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/NimbusSans-Regular... 4939372 3576328 2589160 1183936 4 done.
Can't find (or can't open) font file /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/TimesNewRomanPSMT.
Can't find (or can't open) font file TimesNewRomanPSMT.
Can't find (or can't open) font file /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/TimesNewRomanPSMT.
Can't find (or can't open) font file TimesNewRomanPSMT.
Didn't find this font on the system!
Substituting font Times-Roman for TimesNewRomanPSMT.
Loading NimbusRoman-Regular font from /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/NimbusRoman-Regular... 5196116 3849418 3003064 1540393 4 done.
Page 2
Substituting font NewCenturySchlbk-Roman for CenturyGothic.
Substituting font NewCenturySchlbk-Bold for CenturyGothic,Bold.
Substituting font NewCenturySchlbk-Italic for CenturyGothic,Italic.
Loading C059-Italic font from /usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/C059-Italic... 5504628 4138508 2467960 1088660 4 done.
问题是：为什么MacOSX Preview没有这个问题？从哪里获取字体，完美渲染？
我需要看到你的PDF文件能够发表评论，但你说“我甚至告诉gs字体在哪里”，我担心这似乎不正确。
Ghostscript后台频道说：
无法找到（或无法打开）字体文件/usr/local/Cellar/ghostscript/9.26/share/ghostscript/9.26/Resource/Font/ArialMT。
所以要么文件不存在，要么Ghostscript不能打开它，或者只是可能以某种方式损坏它。
fontconfig是你用来'告诉gs字体在哪里'的唯一东西吗？因为如果是这样，你并没有真正告诉Ghostscript。另请注意fontconfig警告，我不是font config的专家，但我怀疑你可能也想对它进行排序。
Ghostscript可能会，也可能不会使用fontconfig，具体取决于它是如何构建的，这显然是我不知道的。如果您实际上告诉Ghostscript有关字体（而不是fontconfig），那么它可能会更好。你需要编辑/创建一个fontmap.GS文件，并使用-I（Include）开关告诉Ghostscript在哪里找到它。
你可以在/ ghostscript / Resource / Init中找到一个示例fontmap.GS
为了帮助更多我需要知道字体文件所在的确切路径，您使用的方法告诉Ghostscript字体文件所在的位置，以及fontmap.GS的确切配置（或者其他任何意味着你正在使用）。如果字体文件以某种方式损坏，PDF文件和字体文件也会有所帮助。我也很好奇ArialMT和C059-Roman字体的格式。 PostScript或TrueType字体？