Hello
Someone wrote an article about that.
How To Convert PDF to Image Using Ghostscript API[
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Basically it is something like that:
var pdfConverter = new Converter();
pdfConverter.OutputFormat = "jpeg";
pdfConverter.JPEGQuality = 100;
pdfConverter.ResolutionX = 300;
pdfConverter.ResolutionY = 300;
pdfConverter.FirstPageToConvert = 1;
pdfConverter.LastPageToConvert = 1;
pdfConverter.Convert("source.pdf", "image.jpg");
Valery.