blocks|key|881159|text|tiffg4是一种黑白输出设备。您应该使用tiff24nc或tiff12nc作为输出设备颜色PDFs参见幽灵脚本输出设备。这些将是未压缩的，但您可以通过imagemagick或类似的方式将结果恢复为压缩的TIFF。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|881160|entityMap|0|LINK|mutability|MUTABLE|url|http://pages.cs.wisc.edu/~ghost/doc/AFPL/8.00/Devices.htm#TIFF^0|1G|8|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

tiffg4 is a black&amp;white output device.
You should use tiff24nc or tiff12nc as the output device colour PDFs - see <a href="http://pages.cs.wisc.edu/~ghost/doc/AFPL/8.00/Devices.htm#TIFF" rel="noreferrer">ghostscript output devices</a>.
These will be uncompressed but you could put the resulting TIFFs through imagemagick or similar to resave as compressed TIFF.

blocks|key|1237315|text|我使用ImageMagick已经有一段时间了。这是一个非常好的工具，有很多功能。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237316|安装ImageMagick并运行以下命令。这就是我在Linux上使用的，您可能必须用正确的convert替换。|offset|length|style|CODE|1237317|以下命令将PDF转换为CCITT+3标准TIF(传真标准)：|BOLD|1237318|convert+-define+quantum:polarity=min-is-white+\
++++++++-endian+MSB+\
++++++++-units+PixelsPerInch+\
++++++++-density+204x196+\
++++++++-monochrome+\
++++++++-compress+Fax+\
++++++++-sample+1728+\
++++++++"input.pdf"+"output.tif"|code-block|syntax|javascript|1237319|您也可以使用GraphicsMagick，它也类似于ImageMagick，但是ImageMagick更关心质量而不是速度。|1237320|entityMap|0|LINK|mutability|MUTABLE|url|https://www.imagemagick.org/script/download.php#windows|1|http://www.graphicsmagick.org/^0|0|19|7|2|B|0|0|B|7|0|0|6|E|1|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@$D|15|E|16|1|17]]|A|$]]|$1|H|3|I|5|6|7|18|8|@$D|19|E|1A|F|J]]|9|@]|A|$]]|$1|K|3|L|5|M|7|1B|8|@]|9|@]|A|$N|O]]|$1|P|3|Q|5|6|7|1C|8|@]|9|@$D|1D|E|1E|1|1F]]|A|$]]|$1|R|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]|Z|$5|U|V|W|A|$X|10]]]]

I have been using ImageMagick for quite a sometime. It's very nice tool with a lot of features.
Install <a href="https://www.imagemagick.org/script/download.php#windows" rel="nofollow noreferrer">ImageMagick</a> and run following command. This is what I used on Linux, you may have to replace <code>convert</code> with the correct one.
Below command converts PDFs to CCITT Group 3 standard TIFs (Fax standard):
<pre><code>convert -define quantum:polarity=min-is-white \
 -endian MSB \
 -units PixelsPerInch \
 -density 204x196 \
 -monochrome \
 -compress Fax \
 -sample 1728 \
 &quot;input.pdf&quot; &quot;output.tif&quot;
</code></pre>
Also you may use <a href="http://www.graphicsmagick.org/" rel="nofollow noreferrer">GraphicsMagick</a>, it is also similar to ImageMagick, but ImageMagick more concerns with quality than speed.

blocks|key|885832|text|与其他帖子建议的一样，使用颜色格式(例如-sDEVICE=tiff24nc)并指定更高的分辨率(例如-r600x600)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|885833|gswin32c.exe+-q+-dNOPAUSE+-r600+-sDEVICE=tiff24nc+-sOutputFile=a.tif+a.pdf+-c+quit|code-block|syntax|javascript|885834|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Like other posts suggested, use a color format (e.g. -sDEVICE=tiff24nc) and specify a higher resolution (e.g. -r600x600):

<pre><code>gswin32c.exe -q -dNOPAUSE -r600 -sDEVICE=tiff24nc -sOutputFile=a.tif a.pdf -c quit
</code></pre>

blocks|key|885776|text|做传真机真是太好了！-)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|885777|丹尼欧的答案可能是最好的，如果你需要一个彩色副本。|885778|我还从链接线程中注意到，您忽略了为输出指定DPI，因此看起来很糟糕.如果你需要纯抖动的B&W，你应该使用更高的分辨率。|885779|我还用NConvert获得了一个好看的图像|offset|length|885780|nconvert+-page+1+-out+tiff+-dpi+200+-c+2+-o+c.tif+FMD.pdf|code-block|syntax|javascript|885781|我提到它是为了记录在案，因为我认为您需要一个许可证才能重新分发它(否则它是免费供个人使用的)。|885782|entityMap|0|LINK|mutability|MUTABLE|url|http://pagesperso-orange.fr/pierre.g/xnview/en_nconvert.html^0|0|0|0|3|8|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@$H|12|I|13|1|14]]|A|$]]|$1|J|3|K|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

It is quite nice for a fax! ;-)

danio's answer is probably the best, if you need a color copy.

I notice also, from the linked thread, that you omitted to specify DPI for the output, hence the bad look... If you need pure dithered B&amp;W, you should use a higher resolution.

I also got a good looking image using <a href="http://pagesperso-orange.fr/pierre.g/xnview/en_nconvert.html" rel="nofollow noreferrer" title="NConvert">NConvert</a>

<pre><code>nconvert -page 1 -out tiff -dpi 200 -c 2 -o c.tif FMD.pdf
</code></pre>

I mention it for the record, because I think you need a license to redistribute it (it is free for personal use otherwise).

blocks|key|1237200|text|谢谢，伙计们，这就是我最后的下场|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237201|+++++os.popen('+'.join([
+++++++++++++++++++++++self._ghostscriptPath+%2B+'gswin32c.exe',+
+++++++++++++++++++++++'-q',
+++++++++++++++++++++++'-dNOPAUSE',
+++++++++++++++++++++++'-dBATCH',
+++++++++++++++++++++++'-r800',
+++++++++++++++++++++++'-sDEVICE=tiffg4',
+++++++++++++++++++++++'-sPAPERSIZE=a4',
+++++++++++++++++++++++'-sOutputFile=%25s+%25s'+%25+(tifDest,+pdfSource),
+++++++++++++++++++++++]))|code-block|syntax|javascript|1237202|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Thanks guys this is what I ended up with

<pre><code> os.popen(' '.join([
 self._ghostscriptPath + 'gswin32c.exe', 
 '-q',
 '-dNOPAUSE',
 '-dBATCH',
 '-r800',
 '-sDEVICE=tiffg4',
 '-sPAPERSIZE=a4',
 '-sOutputFile=%s %s' % (tifDest, pdfSource),
 ]))
</code></pre>

blocks|key|238149|text|setori的命令没有为tiffg4输出指定要使用的分辨率。其结果是:+Ghostscript将对该输出使用其默认设置，即204x196dpi。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|238150|为了将分辨率提高到600+add，添加一个-r600命令行参数：|offset|length|style|CODE|238151|gswin32c.exe+%5E
+++-o+output.tiff+%5E
+++-sDEVICE=tiffg4+%5E
+++-r600+%5E
++++input.pdf|code-block|syntax|javascript|238152|还请注意，TIFFG4是标准的传真格式，因此它只使用黑色%2B白色/灰度，但不使用颜色。|238153|@jeff:，您用Ghostscript尝试过-dDITHERPPI=<lpi>参数吗？(+lpi的合理值为N/5+~+N/20，其中N是以dpi为单位的分辨率。因此，对于-r600，请尝试使用-dDITHERPPI=30+to+dDITHERPPI=120)。|BOLD|238154|entityMap^0|0|L|5|0|0|0|0|6|N|H|2E|5|2P|E|37|E|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|X|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|Y|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Z|8|@$D|10|E|11|F|Q]|$D|12|E|13|F|G]|$D|14|E|15|F|G]|$D|16|E|17|F|G]|$D|18|E|19|F|G]]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$]]

setori's command does not specify the resolution to use for the tiffg4 output. The consequence is: Ghostscript will use its default setting for that output, which is 204x196dpi.

In order to increase the resolution to 600dpi, add a <code>-r600</code> commandline parameter:

<pre><code>gswin32c.exe ^
 -o output.tiff ^
 -sDEVICE=tiffg4 ^
 -r600 ^
 input.pdf
</code></pre>

Also note that TIFFG4 is the standard fax format and as such it uses black+white/grayscale only, but no colors.

@jeff: Have you ever tried the <code>-dDITHERPPI=&lt;lpi&gt;</code> parameter with Ghostscript? (Reasonable values for lpi are N/5 to N/20, where N is the resolution in dpi. So for <code>-r600</code> use try with <code>-dDITHERPPI=30</code> to <code>dDITHERPPI=120</code>).

blocks|key|1237379|text|我在传真页上也遇到了同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1237380|我在php中使用Imagick，这个命令修复了它的外观。|1237381|$Imagick->blackThresholdImage('grey');|code-block|syntax|javascript|1237382|我没有看到任何使用'gs‘的阈值选项，但转换也可能对您有用。|1237383|convert+a.pdf+-threshold+60%25+a.tif|1237384|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I ran into the same problem with fax pages.

I was using Imagick in php and this command fixed the way it looked.

<pre><code>$Imagick-&gt;blackThresholdImage('grey');
</code></pre>

I didn't see any threshold option using 'gs' but convert may also work for you.

<pre><code>convert a.pdf -threshold 60% a.tif
</code></pre>

My stomach churns when I see this kind of output.

<a href="http://www.freeimagehosting.net/uploads/e1097a5a10.jpg" rel="nofollow noreferrer">http://www.freeimagehosting.net/uploads/e1097a5a10.jpg</a>

and this was my command
as suggested by <a href="https://stackoverflow.com/questions/75500/best-way-to-convert-pdf-files-to-tiff-files#221341">Best way to convert pdf files to tiff files</a>

<pre><code>gswin32c.exe -q -dNOPAUSE -sDEVICE=tiffg4 -sOutputFile=a.tif a.pdf -c quit
</code></pre>

What am I doing wrong?

(commercial products will not be considered)

Ghostscript PDF -> TIFF conversion is awful for me, people rave about it, I alone look sullen

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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当我看到这样的输出时，我的胃就会翻腾。这是我的命令，正如所建议的gswin32c.exe -q -dNOPAUSE -sDEVICE=tiffg4 -sOutputFile=a.tif a.pdf -c quit我做错了什么？(不考虑商业产品)

问Ghostscript PDF -> TIFF转换对我来说很糟糕，人们对此赞不绝口，我独自看上去闷闷不乐。
EN

回答 7

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问Ghostscript PDF -> TIFF转换对我来说很糟糕，人们对此赞不绝口，我独自看上去闷闷不乐。EN

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问Ghostscript PDF -> TIFF转换对我来说很糟糕，人们对此赞不绝口，我独自看上去闷闷不乐。
EN