Hi Baenech i think instead of using a custom variable you could tackle it a different way...
You are interested in getting a total number based on pixel ratio. From a list of results you could have lets say 30 or 40 results in a given time frame. You could eventually make yourself a list of accepted ratios that qualify. So lets say by the time you look at your results you are left with 10 or 15 of them. You then could filter your results from the list of the total resolutions. Piwik results can be filtered. Doesnt require a custom variable, will capture those that you qualify as being high ratio. Its indirect but gives you the same result!
You are interested in getting a total number based on pixel ratio. From a list of results you could have lets say 30 or 40 results in a given time frame. You could eventually make yourself a list of accepted ratios that qualify. So lets say by the time you look at your results you are left with 10 or 15 of them. You then could filter your results from the list of the total resolutions. Piwik results can be filtered. Doesnt require a custom variable, will capture those that you qualify as being high ratio. Its indirect but gives you the same result!