WebOptions.AllowPNG property (Excel)
True if Portable Network Graphics (PNG) is allowed as an image format when you save documents as a webpage. False if PNG is not allowed as an output format. The default value is False. Read/write Boolean.
expression A variable that represents a WebOptions object.
If you save images in the PNG format as opposed to any other file format, you might improve the image quality or reduce the size of those image files, and therefore decrease the download time, assuming that the web browsers that you are targeting support the PNG format.
This example enables PNG as an output format for the first workbook.
Application.Workbooks(1).WebOptions.AllowPNG = True
Alternatively, PNG can be enabled as the global default for the application for newly created documents.
Application.DefaultWebOptions.AllowPNG = True
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