You probably could have another field, with an auto enter calculation that substitutes 1 for blue, 2 for red, 3 for green. This field doesn't have to be on the survey layout, but can be on a layout of survey results, which could then be used to export.
Use values from field value lists can display text yet enter numeric values into the field--even check box and radio button formats can be set to do this.
How you structure your tables and relationships can make it much easier to analyze your results. I suggest something along the lines of the example found here: Need aid on generating a report from a survey layout.
"Use values from field value lists can display text yet enter numeric values into the field--even check box and radio button formats can be set to do this."
How can I do this??
Create a table with two fields. One field stores the text. One field stores the numeric value associated with it.
Create one record in this table for each value and enter the appropriate text and numbers.
Define a "use values from field" value list and select the number field for field1, the text field for field 2.
Select the "Show only values from second field" option.
Use this value list with any value list format, check boxes, drop down lists etc. The value list will display the text, but enter the number.
Note that the text field must be indexed and the values in the text field must be unique for each record.
If you have never created a "use values from field" value list, you might check out the illustrated step by step instructions for setting one up found in Adventures in FileMaking #1 - conditional value lists.