Adds a watermark to this WatermarkableImage. This method assumes that watermark offset and size are measured in pixels (if they are assigned). (inherited from WatermarkableImage)
The width of this WatermarkableImage in pixels. (inherited from WatermarkableImage)
Example
importgroupdocs.watermarkasgwimportgroupdocs.watermark.contents.spreadsheetasgwc_xlswithopen("test.png","rb")asf:img=gwc_xls.SpreadsheetWatermarkableImage(f.read())# img can be assigned to shape.image, chart background, etc.