Exportar hoja de cálculo o gráfico a imagen con ancho y alto deseados via JavaScript

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El siguiente código exporta la hoja de cálculo a una imagen con tamaño de 400x400.

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Worksheet to Image (Desired Size) Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, ImageOrPrintOptions, SheetRender, ImageType } = AsposeCells;

        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');
            if (!fileInput.files.length) {
                document.getElementById('result').innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
                return;
            }

            const file = fileInput.files[0];
            const arrayBuffer = await file.arrayBuffer();

            // Create workbook object from uploaded file
            const workbook = new Workbook(new Uint8Array(arrayBuffer));

            // Access first worksheet
            const worksheet = workbook.worksheets.get(0);

            // Set image or print options: one page per sheet, PNG, desired dimensions 400x400
            const opts = new ImageOrPrintOptions();
            opts.onePagePerSheet = true;
            opts.imageType = ImageType.Png;
            // Converted setter with multiple params to a single property assignment (array)
            opts.desiredSize = [400, 400, false];

            // Render sheet into image
            const sr = new SheetRender(worksheet, opts);
            const imageData = sr.toImage(0);

            const blob = new Blob([imageData], { type: 'image/png' });
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'outputWorksheetToImageDesiredSize.png';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Image';

            document.getElementById('result').innerHTML = '<p style="color: green;">Image generated successfully! Click the download link to get the PNG file.</p>';
        });
    </script>
</html>
Crear una imagen transparente de una hoja de cálculo de Excel con JavaScript a través de C++ Renderizar hoja de cálculo a contexto gráfico con JavaScript via C++