Create Transparent Image of Excel Worksheet with Node.js via C++

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.getTransparent() property to apply transparency to the 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.

Output without transparency: the cell background is white

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

Output with transparency enabled

The following sample code generates a transparent image from an Excel worksheet.

const path = require("path");
const AsposeCells = require("aspose.cells.node");

// Source directory
const sourceDir = path.join(__dirname, "data");

// Output directory
const outputDir = path.join(__dirname, "output");

// Create workbook object from source file
const wb = new AsposeCells.Workbook(path.join(sourceDir, "sampleCreateTransparentImage.xlsx"));

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

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

// Create image after applying image or print options
const sr = new AsposeCells.SheetRender(wb.getWorksheets().get(0), imgOption);
sr.toImage(0, path.join(outputDir, "outputCreateTransparentImage.png"));