Ghostscript 多页 PDF 转 PNG

发布于 2024-07-22 03:06:17 字数 987 浏览 5 评论 0原文

我一直在使用 Ghostscript 从 pdf 中生成单个页面的 pdf 图像。现在我需要能够从 pdf 中提取多个页面并生成一个长垂直图像。

我是否缺少一个可以允许这样做的论点？

到目前为止，当我调用 Ghostscript 时，我使用以下参数：

string[] args ={
                "-q",                     
                "-dQUIET",                   
                "-dPARANOIDSAFER", // Run this command in safe mode
                "-dBATCH", // Keep gs from going into interactive mode
                "-dNOPAUSE", // Do not prompt and pause for each page
                "-dNOPROMPT", // Disable prompts for user interaction                           
                "-dFirstPage="+start,
                "-dLastPage="+stop,   
                "-sDEVICE=png16m",
                "-dTextAlphaBits=4",
                "-dGraphicsAlphaBits=4",
                "-r300x300",                

                // Set the input and output files
                String.Format("-sOutputFile={0}", tempFile),
                originalPdfFile
            };

原文

I've been using ghostscript to do pdf to image generation of a single page from the pdf. Now I need to be able to pull multiple pages from the pdf and produce a long vertical image.

Is there an argument that I'm missing that would allow this?

So far I'm using the following arguments when I call out to ghostscript:

string[] args ={
                "-q",                     
                "-dQUIET",                   
                "-dPARANOIDSAFER", // Run this command in safe mode
                "-dBATCH", // Keep gs from going into interactive mode
                "-dNOPAUSE", // Do not prompt and pause for each page
                "-dNOPROMPT", // Disable prompts for user interaction                           
                "-dFirstPage="+start,
                "-dLastPage="+stop,   
                "-sDEVICE=png16m",
                "-dTextAlphaBits=4",
                "-dGraphicsAlphaBits=4",
                "-r300x300",                

                // Set the input and output files
                String.Format("-sOutputFile={0}", tempFile),
                originalPdfFile
            };

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活泼老夫 2024-07-29 03:06:17

我最终将“%d”添加到“OutputFile”参数中，以便它每页生成一个文件。然后我读取所有文件并将它们用我的 C# 代码拼接在一起，如下所示：

var images =pdf.GetPreview(1,8); //All of the individual images read in one per file

using (Bitmap b = new Bitmap(images[0].Width, images.Sum(img=>img.Height))) {
    using (var g = Graphics.FromImage(b)) {
        for (int i = 0; i < images.Count; i++) {
            g.DrawImageUnscaled(images[i], 0, images.Take(i).Sum(img=>img.Height));
        }
    }
    //Do Stuff
}

I ended up adding "%d" to the "OutputFile" parameter so that it would generate one file per page. Then I just read up all of the files and stitched them together in my c# code like so:

var images =pdf.GetPreview(1,8); //All of the individual images read in one per file

using (Bitmap b = new Bitmap(images[0].Width, images.Sum(img=>img.Height))) {
    using (var g = Graphics.FromImage(b)) {
        for (int i = 0; i < images.Count; i++) {
            g.DrawImageUnscaled(images[i], 0, images.Take(i).Sum(img=>img.Height));
        }
    }
    //Do Stuff
}

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残月升风 2024-07-29 03:06:17

如果您可以使用 ImageMagick，则可以使用它的一个好命令：

montage -mode Concatenate -tile 1x -density 144 -type Grayscale input.pdf output.png

其中

-密度 144 确定以 dpi 为单位的分辨率，如果需要，请增加它，默认值为 72
-type Grayscale 使用如果您的 PDF 没有颜色，您将在生成的图像中节省一些 KB

If you can use ImageMagick, you could use one of its good commands:

montage -mode Concatenate -tile 1x -density 144 -type Grayscale input.pdf output.png

where

-density 144 determins resolution in dpi, increase it if needed, default is 72
-type Grayscale use it if your PDF has no colors, you'll save some KBs in the resulting image

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