I have a selection of polygon feature and with a cursor loop I walk through them. I determine the extent of eachfeature and arcmap will zoom to the feature. My default selection color in ArcMap is light-blue. So the whole selection is light-blue. After determining the extent of each feature I create a png-file on disc. Is there a way that the corresponding feature for the selected cursor row will be red before I create my file on disc.
If you have more than one feature already selected on your layer and you are running your cursor on this layer (i.e., selected features), you may prefer to use SQL query argument (i.e., where_clause, see for example Search Cursor) of the cursor(s) instead of actual selection. If this selection is based on a simple query via Select By Attribute, you can just replace this with aforementioned where_clause.
Colour issue can be handled via Selection Menu>Selection Option and you will see the default selection colour option.As far as I remember it remains saved in the mxd, does not change original selection colour for your other maps.