'Ghostscript PDF fonts becomes boxes in Adobe Illustrator where as its output is fine when opened in Adobe Acrobat

I need to convert the PDF of RGB color space to Grayscale using commandline tool supporting for Windows and Linux. When i used Ghostscript the conversion is happening but when the output is opened in illustrator the fonts were shown as boxes. Is there any solution option available in Ghostscript to overcome this font issue. Is there any other commandline tool available for this conversion. The font encoding is always built in is there any ways available to change it as ANSI encoding.Screenshot of font issue on illustrator VS the working scenario on acrobat

ghostscriptacrobatadobe-illustrator


Solution 1:[1]

Pictures of the problem really don't help. You need to provide the following:

  1. The version of Ghostscript you are using, and the platform (Linux, Windows etc), the word size of the version of Ghostscript and where you sourced this version of Ghostscript from (official Ghostscript download page, package, self-built binary).

  2. An example file to reproduce the problem

  3. The exact command line you used to reproduce the problem, and any supporting files required.

I suspect that your problem is that the original PDF file does not include the fonts that it uses, and that you have left SubsetFonts as true, and have left the AlwaysEmbed and NeverEmbed arrays untouched. This will mean that the new PDF file also does not include the fonts, which means that any PDF consumer must use a substitute font. The 'boxes' you refer to are /.notdef glyphs which are used when the font does not contain the glyph being requested.

Having the Encoding 'built-in' doesn't help with anything at all, it's the presence or absence of the fonts which matters. No, you can't change the encoding to 'ANSI', if you do that (assuming it isn't already WinAnsiEncoding) you'll see very similar problems to the ones you are complaining of here. You would also need to change the text character codes in the PDF file to be able to change the Encoding.

You could also raise this as a bug at https://bugs.ghostscript.com, where you will also have to supply an example file (as simple as possible) and all the other information listed above.

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