如何缩小PDF格式的内容？ [英] How to down scale content of a pdf?

问题描述

我有一个pdf，我需要缩小规模。 pdf处于A4纵向模式，我需要的是将pdf的内容缩小到5％，并将其放入A4 A4和纵向模式的新PDF中。它不是将pdf转换为图像，缩放它们并将其放回pdf的选项。我正在寻找一种方法来解决这个问题。有没有办法用pdfbox或itext解决这个问题？

i have a pdf which I need to down scale. The pdf is in A4 portrait mode, what I need is to shrink the content of the pdf to 5 % and put this into a new PDF also in size A4 and portrait mode. Its not an option to convert the pdf to images, scale them and put it back to a pdf. I am looking for a way to solve this in java. Is there a way to solve this with pdfbox or itext?

推荐答案

如果您使用 iText 7 ，这是一个选项：

If you use iText 7, then this is an option:

public void manipulatePdf(String src, String dest) throws IOException {
    PdfDocument pdfDoc = new PdfDocument(new PdfReader(src), new PdfWriter(dest));
    int n = pdfDoc.getNumberOfPages();
    PdfPage page;
    for (int p = 1; p <= n; p++) {
        new PdfCanvas(pdfDoc.getPage(p).newContentStreamBefore(),
                new PdfResources(), pdfDoc).writeLiteral("\nq 0.05 0 0 0.05 0 0 cm\nq\n");
        new PdfCanvas(pdfDoc.getPage(p).newContentStreamAfter(),
                new PdfResources(), pdfDoc).writeLiteral("\nQ\nQ\n");
    }
    pdfDoc.close();
}

请注意5％（ 0.05 writeLiteral（）方法中的值非常小。如果有文字，将很难阅读它所说的内容。也许你的意思是95％。在这种情况下，使用： writeLiteral（\ nq 0.95 0 0 0.95 0 0 cm\\\
q\\\
）。

Note that 5% (the 0.05 values in the writeLiteral() method) is really small. If there's text, it will be very hard to read what it says. Maybe you meant 95%. In that case use: writeLiteral("\nq 0.95 0 0 0.95 0 0 cm\nq\n").

来源：如何缩小现有PDF中的页面？

注意：iText 5已停产，但iText 5答案已经确定发布于2014年的Stack Overflow：收缩轮换PDF页面在现有PDF中使用矩形

Note: iText 5 is being discontinued, but the iText 5 answer was already posted on Stack Overflow in 2014: Shrink PDF pages with rotation using Rectangle in existing PDF

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