Access dTextAlphaBits and dGraphicsAlphaBits properties of Ghostscript

[tomasr78]

I do not find a way to set dTextAlphaBits and dGraphicsAlphaBits properties while converting PDF to Image.

The PdfReadDefines class has five properties but dTextAlphaBits and dGraphicsAlphaBits are missing among them. It also has IEnumerable<IDefine> Defines property which is read-only and I can't add my own defines. The PdfReadDefines
inherit from DefinesCreator where I find some create defines method but unfortunately these properties are protected.

[dlemstra]

The dTextAlphaBits and dGraphicsAlphaBits option is set with the AntiAlias option of the ReadSettings. The default is true and then it passes the value 4 when it is false 1 will be passed instead.

Do you need more control over these options?