用于调整 pdf 文档大小并更改其 DPI 的 GUI 程序

Question

我看到 LibreOffice Draw 应该能够打开一个 pdf 并使用更改质量和 DPI 分辨率的选项将其导出。但是我拥有的高分辨率扫描 pdf 在这个应用程序中没有正确打开（只导入第一页）所以我想找到一个更专业的应用程序。

此时我并没有要求命令行选项（我的 pdf 文件太大了，我以这种方式尝试的所有方法都失败了）。

Answer 1

鹦鹉螺脚本

代码

我已经能够使用这个 Nautilus 脚本成功地调整我的 PDF 的大小：

#! /bin/bash

# AUTHOR:   (c) Ricardo Ferreira, oriolpont -- modified in accordance to https://askubuntu.com/q/280618/81372
# NAME:     Compress PDF 1.4.2
# DESCRIPTION:  A nice Nautilus script with a GUI to compress and optimize PDF files
# REQUIRES: ghostscript, poppler-utils, zenity, sed, python-notify (optional)
# LICENSE:  GNU GPL v3 (http://www.gnu.org/licenses/gpl.html)
# WEBSITE:  https://launchpad.net/compress-pdf

VERSION="1.4.2"
COMPRESSPDF_BATCH_ABORT_ERR=115

# Messages
        # English (en-US)
        error_nofiles="No file selected."
        error_noquality="No optimization level selected."
        error_ghostscript="PDF Compress requires the ghostscript package, which is not installed. Please install it and try again."
        error_nopdf="At least one of the selected file(s) is not a valid PDF archive."
        label_filename="Save PDF as..."
        label_level="Please choose an optimization level below."
        optimization_level="Optimization Level"
        level_default="Default" # apparently close to High Quality
        level_screen="Screen-view only (72dpi)"
        level_low="Low Quality (150dpi)"
        level_high="High Quality (300dpi)"
        level_color="High Quality (Color Preserving) (300dpi)"
        job_done="has been successfully compressed"
        filename_suffix="_opt"
        label_suffix="Choose the suffix for the filenames."
        warning_overwrite="That will overwrite the original pdf files."


case $LANG in

    pt* )
        # Portuguese (pt-PT)
        error_nofiles="Nenhum ficheiro seleccionado."
        error_noquality="Nenhum nível de optimização escolhido."
        error_ghostscript="O PDF Compress necessita do pacote ghostscript, que não está instalado. Por favor instale-o e tente novamente."
        error_nopdf="O ficheiro seleccionado não é um ficheiro PDF válido."
        label_filename="Guardar PDF como..."
        label_level="Por favor escolha um nível de optimização abaixo."
        optimization_level="Nível de Optimização"
        level_default="Normal"
        level_screen="Visualização no Ecrã"
        level_low="Baixa Qualidade"
        level_high="Alta Qualidade"
        level_color="Alta Qualidade (Preservação de Cores)"
        job_done="foi comprimido com sucesso"
        filename_suffix="-otimizado";;


    es* )
        # Spanish (es-AR) by Eduardo Battaglia
        error_nofiles="Ningún archivo seleccionado."
        error_noquality="Ningún nivel de optimización escogido."
        error_ghostscript="Compress PDF necesita el paquete ghostscript, que no está instalado. Por favor instálelo e intente nuevamente."
        label_filename="Guardar PDF como..."
        label_level="Por favor escoja un nivel de optimización debajo."
        optimization_level="Nivel de Optimización"
        level_default="Normal"
        level_screen="Sólo visualización"
        level_low="Baja calidad"
        level_high="Alta calidad"
        level_color="Alta calidad (Preservación de Colores)"
        filename_suffix="-optimizado";;


    cs*)
       # Czech (cz-CZ) by Martin Pavlík
        error_nofiles="Nebyl vybrán žádný soubor."
        error_noquality="Nebyla zvolena úrove? optimalizace."
        error_ghostscript="PDF Compress vyžaduje balí?ek ghostscript, který není nainstalován. Nainstalujte jej prosím a opakujte akci."
        label_filename="Uložit PDF jako..."
        label_level="Prosím vyberte úrove? optimalizace z níže uvedených."
        optimization_level="Úrove? optimalizace"
        level_default="Výchozí"
        level_screen="Pouze pro ?tení na obrazovce"
        level_low="Nízká kvalita"
        level_high="Vysoká kvalita"
        level_color="Vysoká kvalita (se zachováním barev)"
        filename_suffix="-optimalizované";;


    fr*)
       # French (fr-FR) by Astromb
        error_nofiles="Aucun fichier sélectionné"
        error_noquality="Aucun niveau d'optimisation sélectionné"
        error_ghostscript="PDF Compress a besoin du paquet ghostscript, mais il n'est pas installé. Merci de l'installer et d'essayer à nouveau."
        error_nopdf="Le fichier que vous avez sélectionné n'est pas un PDF valide."
        label_filename="Sauvegarder le PDF sous..."
        label_level="Merci de choisir, ci-dessous, un niveau d'optimisation."
        optimization_level="Niveau d'optimisation"
        level_default="Défaut"
        level_screen="Affichage à l'écran"
        level_low="Basse qualité"
        level_high="Haute qualité"
        level_color="Haute qualité (Couleurs préservées)"
        filename_suffix="-optimisé";;


    zh_CN*)
        # Simplified Chinese (zh_CN) by TualatriX Chou
        error_nofiles="???????"
        error_noquality="?????????"
        error_ghostscript="PDF????ghostscript??????????????????????"
        error_nopdf="????????????PDF??"
        label_filename="???PDF..."
        label_level="??????????"
        optimization_level="????"
        level_default="??"
        level_screen="???????"
        level_low="???"
        level_high="???"
        level_color="??????? "
        filename_suffix="-??";;


        ar*)
                # Arabic (ar) by Mohammed hasan Taha
        error_nofiles="?? ??? ?????? ???"
        error_noquality="?? ??? ?????? ???? ?????"
        error_ghostscript="??? ??????? ????? ???? ghostscript package ??? ???? ??????? ?? ????? ????????"
        error_nopdf="????? ???? ?? ??????? ??? ??? pdf ????"
        label_filename="??? ????? ????"
        label_level="?????? ?????? ???? ?????"
        optimization_level="???? ?????"
        level_default="???????"
        level_screen="??? ?????? ???(?????? ?????? ???????)"
        level_low="???? ??????"
        level_high="???? ??????"
        level_color="???? ????? ???"
        filename_suffix="-??????";;


    ml_IN*)
        # Malayalam (ml_IN) by Hrishikesh K B
        error_nofiles="??? ????? ????????????????????."
        error_noquality="?????? ??????????????? ?????? ????????????????????."
        error_ghostscript="?? ?? ??? ???????????? ???????? ???????????? ???????? ?????????. ? ???????? ????????????? ??????? ???? ?????? ??????? ??????????."
        error_nopdf="???????????? ????? ??????? ??? ??????? ?????????? ????."
        label_filename="??????? ??????? ????????????..."
        label_level="?????? ???? ??????? ??? ??????????????? ?????? ??????????????."
        optimization_level="??????????????? ?????? "
        level_default="???????????"
        level_screen="??????????? ??????? ?????? "
        level_low="?????? ???????"
        level_high="????? ??????? "
        level_color="????? ??????? (???? ????????????????????)";;


    he*)
        # Hebrew (he-IL) by Yaron (from Launchpad question)
        error_nofiles="?? ???? ?? ????."
        error_noquality="?? ????? ??? ??????."
        error_ghostscript="?????? PDF Compress ????? ?? ?????? ghostscript, ????? ??????. ?? ?????? ???? ?????? ???."
        error_nopdf="????? ????? ???? ?????? PDF ????."
        label_filename="????? ?? PDF ???..."
        label_level="?? ????? ?? ??? ?????? ????."
        optimization_level="??? ??????"
        level_default="???? ????"
        level_screen="?????? ??? ????"
        level_low="????? ?????"
        level_high="????? ?????"
        level_color="????? ????? (????? ????)"
        job_done="?????? ??????? ??????";;

esac



# Check if Zenity is installed
if ! ZENITY=$(which zenity)
then
    echo "error: Compress PDF $VERSION needs zenity to run." # maybe we could translate this someday
    exit 1
fi

# Check if Ghostscript is installed
if ! GS=$(which gs)
then
    $ZENITY --error --title="Compress PDF $VERSION" --text="$error_ghostscript"
    exit 1
fi

# Check if the user has selected any files
# if [ "x$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" = "x"  -o  "$#" = "0" ] # we double check. Remove the first part if you plan to manually invoke the script

if [ "$#" = "0" ] # removed nautilus specific variable to make the script compatible with other file managers
then
    $ZENITY --error --title="Compress PDF $VERSION" --text="$error_nofiles"
    exit 1
fi

# Check if we can properly parse the arguments
INPUT=("$@")
N=("$#")
if [ "${#INPUT[@]}" != "$N" ] # comparing the number of arguments the script is given with what it can count
then
    $ZENITY --error --title="Compress PDF $VERSION" # if we arrive here, there is something very messed
    exit 1
fi

# Check if all the arguments are proper PDF files
for ARG in "$@"
do
    IS_PDF=$(file --brief --mime-type "$ARG" | grep -i "/pdf") # ignoring case for 'pdf'; as far as I know, the slash before (sth/pdf) is universal mimetype output. In most cases we can even expect 'application/pdf' (portability issues?).
    if [ "x$IS_PDF" = x ]; then NOT_PDF=1; break; fi
done
if [ "x$NOT_PDF" != x ]
then
    $ZENITY --error --title="Compress PDF $VERSION" --text="$error_nopdf"
    exit 1
fi



# Everything is OK. We can go on.



# Ask the user to select an output format
selected_level=$($ZENITY --list --title="Compress PDF "$VERSION"" --text "$label_level" --radiolist --column "" --column "$optimization_level" TRUE "$level_default" FALSE "$level_screen" FALSE "$level_low" FALSE "$level_high" FALSE "$level_color" --height 250 --width 400)
if [ "$?" != "0"  -o  "x$selected_level" = x ]; then exit 1; fi

# Select the optimization level to use
case $selected_level in
    "$level_default")
        COMP_COMMAND="/default"
    ;;
    "$level_screen")
        COMP_COMMAND="/screen"
    ;;
    "$level_low")
        COMP_COMMAND="/ebook"
    ;;
    "$level_high")
        COMP_COMMAND="/printer"
    ;;
    "$level_color")
        COMP_COMMAND="/prepress"
    ;;
esac



# Choose output filename(s)
if [ $# -eq 1 ]
then
    pdf_file=$(basename "$1")
    suggested_filename=${pdf_file%.*}${filename_suffix}.${pdf_file##*.}
    output_filename=$($ZENITY --file-selection --save --confirm-overwrite --filename="$PWD/$suggested_filename" --title="$label_filename")
    if [ "$?" != "0"  -o  "x$output_filename" = x ]; then exit 1; fi
else
    filename_suffix=$($ZENITY --entry --title="Compress PDF $VERSION" --text="$label_suffix" --entry-text="$filename_suffix")
    if [ "$?" != "0" ]; then exit 1; fi
    if [ "x$filename_suffix" = x ]
        then if ! $ZENITY --warning --title="Compress PDF $VERSION" --text="$warning_overwrite"; then exit 1; fi
    fi
    case "$filename_suffix" in */*) $ZENITY --error --title="Compress PDF $VERSION"; exit 1; esac # Check if the specified suffix is legal (we use 'case' instead of 'if' to directly use asterisk * globbing -- and avoid [[...]] for portability)
fi



# Finally, we process the files



for arg in "$@" # this processing is partly inspired by Edouard Saintesprit's patch from Compress PDF page at Launchpad
do
    if [ $# -ne 1 ]
    then
        pdf_file=$(basename "$arg")
        output_filename=${pdf_file%.*}${filename_suffix}.${pdf_file##*.}
    fi

    output_name=$(basename "$output_filename")

    temp_pdfmarks=tmp-compresspdf-$output_name-pdfmarks
    temp_filename=tmp-compresspdf-$output_name

    if [ -e $temp_pdfmarks  -o  -e $temp_filename ]; then $ZENITY --error --title="Compress PDF $VERSION"; exit 1; fi

    # Extract metadata from the original PDF. This is not a crucial functionality, but maybe we could warn if pdfinfo or sed are not available
    pdfinfo "$arg" | sed -e 's/^ *//;s/ *$//;s/ \{1,\}/ /g' -e 's/^/  \//' -e '/CreationDate/,$d' -e 's/$/)/' -e 's/: / (/' > "$temp_pdfmarks"
    if ! grep /Title "$temp_pdfmarks"; then echo '  /Title ()' >> "$temp_pdfmarks"; fi # Warning: if the pdf has not defined a Title:, ghostscript makes a fontname become the title.
    # echo -e 0a'\n''  /Title ()''\n'.'\n'w | ed afile # use to prepend instead of append
    sed -i '1s/^ /[/' "$temp_pdfmarks"
    sed -i '/:)$/d' "$temp_pdfmarks"
    echo "  /DOCINFO pdfmark" >> "$temp_pdfmarks"

    # Execute ghostscript while showing a progress bar
    (
        $GS -sDEVICE=pdfwrite -dPDFSETTINGS=$COMP_COMMAND -dColorConversionStrategy=/LeaveColorUnchanged -dCompatibilityLevel=1.4 -dNOPAUSE -dQUIET -dBATCH -dSAFER -sOutputFile="$temp_filename" "$arg" "$temp_pdfmarks" & echo -e "$!\n"
        # we output the pid so that it passes the pipe; the explicit linefeed starts the zenity progressbar pulsation
    ) | ( # the pipes create implicit subshells; marking them explicitly
        read PIPED_PID
        if $ZENITY --progress --pulsate --auto-close --title="Compress PDF $VERSION"
        then
            rm "$temp_pdfmarks"
            mv -f "$temp_filename" "$output_filename" & # we go on to the next file as fast as possible (this subprocess survives the end of the script, so it is even safer)
            notify-send "Compress PDF" "$output_name $job_done"
        else
            kill $PIPED_PID
            rm "$temp_pdfmarks"
            rm "$temp_filename"
            exit $COMPRESSPDF_BATCH_ABORT_ERR # Warning: it exits the subshell but not the script
        fi
    )
    if [ "$?" = "$COMPRESSPDF_BATCH_ABORT_ERR" ]; then break; fi # to break the loop in case we abort (zenity fails)
done

原始来源：https : //launchpad.net/compress-pdf

脚本基于oriolpont 的这个分支，并根据cipricus 的建议进行了修改。

Oriolpont 的修订版进行了多项改进：

• Yaron 的希伯来语翻译
• 基于 Edouard Saintesprit 更改的多文件支持
• 其他几个 bash 调整使脚本更安全（PID 临时文件、GS 的安全模式、更多的初始检查）

截屏

选项

zenity GUI 对话框中提供的选项对应于以下ghostscript设置：

• dPDFSETTINGS=/screen （仅屏幕视图质量，72 dpi 图像）
• dPDFSETTINGS=/ebook （低质量，150 dpi 图像）
• dPDFSETTINGS=/printer （高质量，300 dpi 图像）
• dPDFSETTINGS=/prepress （高质量、保色、300 dpi imgs）
• dPDFSETTINGS=/default （几乎与 /screen 相同）

网站上的更多选项和微调：http : //milan.kupcevic.net/ghostscript-ps-pdf/

来源：用于优化 PDF 的开源命令行工具

您可以在此处找到有关所用选项的更多信息。Oriolpont 的README提供了有关根据您的需要自定义脚本的更多详细信息。

安装

该脚本依赖于许多包。您可以通过以下方式安装它们：

sudo apt-get install ghostscript poppler-utils zenity

如果您不知道如何安装 Nautilus 脚本，请按照本指南进行操作：

如何安装 Nautilus 脚本？

在备用桌面环境上安装

该脚本不依赖于任何自定义 Nautilus 变量，并且可以与几乎所有支持自定义菜单操作的文件管理器一起使用。请参阅您的文件管理器手册以了解如何安装您的脚本。XFCE 用户可以在这里找到一个很好的教程。

当然，您也可以从命令行启动脚本。基本用法：

compresspdf "filename.pdf"

私酒

概述

使用Moonshiner（ghostscript 的 GUI 前端）可以实现对 PDF 输出的更高级控制。

安装

官方存储库中不提供 Moonshiner。不幸的是，我也找不到官方 PPA。只有这个私人 PPA 有一段时间没有更新了。此处.deb可用的存档应该适用于最近的 Ubuntu 修订版，但不要相信我的话。

据我所知，安装 Moonshiner 的最安全方法是直接从其来源。为此，首先下载最新版本：

svn co https://moonshiner.svn.sourceforge.net/svnroot/moonshiner/trunk moonshiner_svn
cd $HOME/moonshiner_svn/

Moonshiner 依赖于 Python、PyGTK 和 Ghostscript。如果满足这些依赖项（它们应该在 Ubuntu 上安装），您可以继续安装应用程序：

sudo python setup.py install

或者使用python的数据包管理工具（sudo apt-get install python-pip）：

python setup.py sdist
sudo pip install $HOME/moonshiner_svn/dist/moonshiner-1.1svn.tar.gz

卸载 Moonshiner 轻而易举pip：

sudo pip uninstall moonshiner

如果您使用第一种安装方法，则必须手动删除所有已安装的文件。

用法

安装后，您应该能够从仪表板或您首选的应用程序启动器启动 Moonshiner。GUI 是不言自明的。要修改 PDF，您只需将文件拖放到界面上，更改所需的设置并点击Go Moonshining！.

“图像”选项卡下的三个独立调节器允许您根据自己的意愿微调 DPI 和质量设置：

我不会在这里深入探讨其他设置，但我鼓励您查阅官方文档以了解您可能遇到的任何问题。

自定义图标

我不太喜欢 Moonshiner 的图标，所以我创建了一个我自己的：

您可以在此处下载 SVG 。该图标基于梦幻般的Faenza图标集，并在相同的许可证 (GNU/GPL) 下发布。