private static void ConvertDocumentToImage(
string inputFile,
string outputFile,
RasterImageFormat outputFormat,
int bitsPerPixel)
{
if (!File.Exists(inputFile))
{
throw new ArgumentException($"{inputFile} not found.", nameof(inputFile));
}
if (bitsPerPixel != 0 && bitsPerPixel != 1 && bitsPerPixel != 2 && bitsPerPixel != 4 &&
bitsPerPixel != 8 && bitsPerPixel != 16 && bitsPerPixel != 24 && bitsPerPixel != 32)
{
throw new ArgumentOutOfRangeException(nameof(bitsPerPixel), bitsPerPixel,
$"Invalid {nameof(bitsPerPixel)} value");
}
using (var codecs = new RasterCodecs())
{
codecs.Options.RasterizeDocument.Load.XResolution = 300;
codecs.Options.RasterizeDocument.Load.YResolution = 300;
// indicates the start of a loop from the same source file
codecs.StartOptimizedLoad();
var totalPages = codecs.GetTotalPages(inputFile);
if (totalPages > 1 && !RasterCodecs.FormatSupportsMultipageSave(outputFormat))
{
Console.WriteLine($"The {outputFormat} format does not support multiple pages.\n"
+ "The resulting file will only contain the only last page of the document.");
}
for (var pageNumber = 1; pageNumber <= totalPages; pageNumber++)
{
Console.WriteLine($"Loading and saving page {pageNumber}");
using (var rasterImage = codecs.Load(inputFile, bitsPerPixel, CodecsLoadByteOrder.Bgr, pageNumber, pageNumber))
codecs.Save(rasterImage, outputFile, outputFormat, bitsPerPixel, 1, -1, 1, CodecsSavePageMode.Append);
}
// indicates the end of the load for the source file
codecs.StopOptimizedLoad();
}
}