图片透明度

// Create a new workbook
Workbook workbook = new Workbook();

// Use sheet index to get worksheet.
IWorksheet worksheet = workbook.getWorksheets().get(0);

// Add a picture
IShape picture = worksheet.getShapes().addPicture("Image.png", 10, 10, 200, 100);

// Set picture's transparency as 60%.
picture.getPictureFormat().setTransparency(0.6);

// Save to an excel file
workbook.save("ImageTransparency.xlsx");