Thanks for contacting support.
You can convert only 4 pages to the image using trial version of the Aspose.Pdf for .NET
API. Please note that you can process only 4 elements of any collection in the API in trial version, so in order to evaluate API and access all features, you can apply for a temporary licence over “Get a Temporary License
” page of our website.
For more information regarding PDF to image conversion, please refer to “Convert PDF Pages
” article(s) in API documentation. In case of any further assistance, please feel free to contact us.