Ghostscript多页PDF转换为PNG [英] Ghostscript Multipage PDF to PNG

问题描述

我一直在使用ghostscript做pdf来从pdf生成单个页面的图像.现在，我需要能够从pdf中提取多个页面并产生一个长的垂直图像.

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.

我是否缺少一个允许这样做的论点?

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

到目前为止，当我调用ghostscript时，我正在使用以下参数:

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
            };

推荐答案

我最终在"OutputFile"参数中添加了％d"，以便每页生成一个文件.然后，我只是读取了所有文件，并用c#代码将它们缝合在一起，如下所示:

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
}

这篇关于Ghostscript多页PDF转换为PNG的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！