ZS20 with iRes and iZoom

 


In this Section:

Testing the Effect of iResolution

iResolution Results and Discussion

Testing the Effect of iZoom

iZoom Results and Discussion



Introduction


I carried out some tests to investigate the effects of using the iResolution and iZoom modes on the ZS20 since the information provided by Panasonic about these features is very brief and cryptic. This is all that is provided:


ZS20/TZ30 Manual, p102:

"You can use the camera’s Intelligent Resolution technology to record still pictures with sharper outlines and clearer resolution. Also, when [i.ZOOM] is set, the zoom ratio can be increased two times higher than the original zoom ratio with limited deterioration of picture quality."


ZS20/TZ30 Manual, p65:

"You can use the camera’s Intelligent Resolution technology to increase the zoom ratio up to 2x higher than the original zoom ratio with limited deterioration of picture quality. Set [i.Resolution] to [i.ZOOM] on the [Rec] menu.  When [i.Resolution] is set to [i.ZOOM], Intelligent Resolution technology is applied to the picture."


Under “iResolution” in the Record Menu there are three options: OFF; ON; and iZoom. Although it isn't actually stated in the manual, my tests showed that if iZoom is chosen, then iResolution will be applied at any zoom setting at and below 20x (480mm), and iZoom will be implemented at any zoom setting between 20x and 40x.


In other words, iZoom cannot be selected without at the same time implementing iResolution for any zoom setting at and below 20x.  Following on from that, when set at exactly 20x zoom, the same result is obtained whether iRes is set to ON or iZoom is set to ON.


Testing of iResolution


For these tests I used a test chart previously set up for resolution testing (shown here).  All the tests were carried out from exactly the same position under uniform lighting using: a tripod; the timer; the stabiliser switched off; A mode; with the same aperture setting and exposure throughout.  Since the effects are very subtle it was necessary to ensure that all the parameters were kept the same so that the actual effects could be detected reliably at high magnification.  Also, since at the pixel level the noise is random, I also took replicate shots to enable the normal shot-to-shot variations to be seen and to be distinguished from the effects of using the iResolution feature.


Since I was not concerned with measuring the absolute values of resolution in these tests but rather the  differences when the iRes and iZoom functions were used, the camera was simply set indoors at a suitable distance from the chart.  The central area of the chart encompassing an Es chart, a converging lines chart and a magazine photo was used for the tests.


Images are shown below from replicate tests conducted at 14MP, 100 ISO, f/6.4, 0.3s, 480mm (equivalent) with iRes ON or OFF (click on an image to see the 100% view):



Above: Chart with iRes switched OFF



Above: Chart with iRes switched ON



Above: Es chart, replicates with iRes ON or OFF



Above: Left part of Birtinya Island photo



Above:  Right part of Birtinya Island photo



Above: Converting lines chart (images have been rotated 90 degrees)


These image comparisons are discussed on the following page.




Continue to iResolution Results and Discussion


Continue to ZS20 with iZoom


Return to ZS20/TZ30 Testing


Return  to Home Page