How to dynamically convert PDF files to images with high definition?

Currently, my PDFs' definition are very high. So I want get images (Jpeg) with high quality when converting from PDF document.

I used Gimp to convert these PDFs to 600dpi images, and the image quality is good. But it can't dynamically convert images. So I am now looking for other tools for high definition conversion. I am particularly interested in such tools, and want to know more about them.

Recently, I am trying to use ImageMagick. I set the DPI to 600, but it will get very small images. Not satisfied with this... So I add a resize command to my program, and the image's definition is much higher. However, it still looks as keeping the default value (type 468x705).

convert *.pdf -resize 1000% -density 600 -quality 100 *.jpg

I have one more question - how to keep the name of target file the same as the original one?

This article on XsPDF.com is what you looking for, check out: converting PDF to high definition images

Answers

You will need tools like XsPDF .NET PDF to Image SDK. Image formats support includes Jpeg, Png, Bmp, Gif, and Tiff. Most importantly, image definition is user-defined.

It seems more difficult to achieve dynamic conversion. Do not worry, just try PDF to images conversion in a loop.

// Create a PDF converter instance by loading a local file 
PdfImageConverter pdfConverter = new PdfImageConverter("sample.pdf");

// Set the dpi, the output image will be rendered in such resolution
pdfConverter.DPI = 96;

// the output image will be rendered to grayscale image or not
pdfConverter.GrayscaleOutput = false;

for (int i = 0; i < pdfConverter.PageCount; i++)
{
    // Convert each pdf page to jpeg image with original page size
    //Image pageImage = pdfConverter.PageToImage(i);
    // Convert pdf to jpg in customized image size
    Image pageImage = pdfConverter.PageToImage(i, 500, 800);

    // Save converted image to jpeg format
    pageImage.Save("Page " + i + ".jpg", ImageFormat.Jpeg);
}