Create Transparent Image of Excel Worksheet

Sometimes, you need to generate the image of your worksheet as a transparent image. You want to apply transparency to all cells which have no fill colors. Aspose.Cells provides the ImageOrPrintOptions.setTransparent() property to apply transparency to worksheet image. When this property is false, then cells with no fill colors are drawn with white color and when it is true, cells with no fill colors are drawn transparent.

In the following worksheet image, transparency has not been applied. The cells with no fill colors are drawn white.

Worksheet image without applying transparency

While, in the following worksheet image, transparency has been applied. The cells with no fill colors are transparent.

Worksheet image after applying transparency

You can use the following sample code to generate a transparent image of your Excel worksheet.

// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Java
// The path to the documents directory.
String dataDir = Utils.getSharedDataDir(CreateTransparentImage.class) + "TechnicalArticles/";
// Create workbook object from source file
Workbook wb = new Workbook(dataDir + "aspose-sample.xlsx");

// Apply different image or print options
ImageOrPrintOptions imgOption = new ImageOrPrintOptions();
imgOption.setImageType(ImageType.PNG);
imgOption.setHorizontalResolution(200);
imgOption.setVerticalResolution(200);
imgOption.setOnePagePerSheet(true);

// Apply transparency to the output image
imgOption.setTransparent(true);

// Create image after apply image or print options
SheetRender sr = new SheetRender(wb.getWorksheets().get(0), imgOption);
sr.toImage(0, dataDir + "CTransparentImage_out.png");