Thank you for contacting Telerik support.
For the first case you can use the ExcelCellFormatting event to export text for the image column:
sender, Telerik.WinControls.UI.Export.ExcelML.ExcelCellFormattingEventArgs e)
(e.GridColumnIndex == 4 && e.GridRowIndex != -1)
//4 is the index of the image column and -1 is the index of the header row
For the second case you can use the HiddenColumnOption
property to export only visible columns:
exporter.HiddenColumnOption = HiddenOption.DoNotExport;
Let me know if you have additional questions.
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