从pdf中识别rgb和cmyk颜色

我有一个PDF，由不同的颜色文本和背景颜色组成。 如何识别使用CMYK或RGB格式的PDF中使用的颜色？

StringBuilder sb_Sourcepdf = new StringBuilder(); PdfReader reader_FirstPdf = new PdfReader(pdf_of_FirstFile); Document document = new Document(); PDFParser parser = new PDFParser(new FileInputStream(pdf_of_FirstFile)); parser.parse(); PDDocument docum = parser.getPDDocument(); PDFStreamEngine engine = new PDFStreamEngine(); PDPage page = (PDPage)docum.getDocumentCatalog().getAllPages().get(0); engine.processStream(page, page.findResources(), page.getContents().getStream()); PDGraphicsState graphicState = engine.getGraphicsState(); string colorname = graphicState.getStrokingColor().getColorSpace().getName(); graphicState.getTextState().getFont(); int r = graphicState.getNonStrokingColor().getJavaColor().getRed(); int g = graphicState.getNonStrokingColor().getJavaColor().getGreen(); int b = graphicState.getNonStrokingColor().getJavaColor().getBlue(); int rgb = graphicState.getNonStrokingColor().getJavaColor().getRGB(); float[] cosp = graphicState.getNonStrokingColor().getColorSpaceValue(); PDColorSpace pd = graphicState.getNonStrokingColor().getColorSpace(); string re = graphicState.getStrokingColor().toString(); int rgbcolor = graphicState.getStrokingColor().getJavaColor().getRGB(); float[] components = { java.awt.Color.black.getRed(), java.awt.Color.black.getGreen(), java.awt.Color.black.getBlue() }; float[] colorSpaceValues = graphicState.getStrokingColor().getColorSpaceValue(); foreach (float c in colorSpaceValues) { Debug.WriteLine(c * 255.00); } 

我使用了pdfbox，但我的价值为0.0

Answer 1

  PdfReader reader_FirstPdf = new PdfReader(pdf_of_FirstFile); for (int i = 1; i <= reader_FirstPdf.NumberOfPages; i++) { TextWithFont_SourcePdf Sourcepdf = new TextWithFont_SourcePdf(); } text_First_File = iTextSharp.text.pdf.parser.PdfTextExtractor.GetTextFromPage(reader_FirstPdf, i, Sourcepdf); public void RenderText(iTextSharp.text.pdf.parser.TextRenderInfo renderInfo) { int r = renderInfo.GetColorNonStroke().R; int g = renderInfo.GetColorNonStroke().G; int b = renderInfo.GetColorNonStroke().B; }