to achieve the same effects, specify the image file in the attribute FileName and the desired Alpha8 format in the attribute Format. We modified the attributes with the verion 9.20 in order to support more formats and conversion features. Please see also the indications in the description of the old attribute AlphaName.
If in your application case you have used originally two image files (one containing color information and the second containing opacity information), use a graphic editor (e.g. Photoshop) to compose the both image files to a single PNG file. The possibility to specify separate files for color and opacity has its origins in the limitation of BMP file format used many years ago. With PNG format such tricks are obsolete.
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