插入透明使用PDFBOX

Question

我打開我的形象到PDF以下列方式爲PDF圖像（谷歌文檔，單詞等） 有沒有一個簡單的方法來做到這一點？

Answer 1

使用擴展的圖形狀態：

stream.saveGraphicsState(); 
PDExtendedGraphicsState pdExtGfxState = new PDExtendedGraphicsState(); 
pdExtGfxState.getCOSObject().setItem(COSName.BM, COSName.MULTIPLY); // pdExtGfxState.setBlendMode(BlendMode.MULTIPLY) doesn't work yet, maybe in later version 
pdExtGfxState.setNonStrokingAlphaConstant(0.5f); 
contentStream.setGraphicsStateParameters(pdExtGfxState); 
// do your stuff 
stream.restoreGraphicsState();