Resolution measurements - TZ30 (ZS20) - Many images

Started Apr 3, 2013 | Discussions thread
Ianperegian
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A possible explanation
In reply to Ianperegian, May 5, 2013

For digital camera sensors, optical crosstalk results in poor resolution and colour mixing, and tends to worsen as the pixel size becomes smaller.  Optical crosstalk is explained here .

An article which discusses optical crosstalk in relation to CMOS sensors can be viewed here .

I calculated a measure of pixel size (the sensor area per pixel) from the data given by DPR for various camera models, as shown in the table below:

The Panasonic FZ50 and the models listed below it in the above table have now all been tested using Jimmy's charts.  In all cases these models show a similar pattern of resolution for the different coloured Es, such as the low resolution of yellow Es on a white background.  These models use CCD, CMOS or 3MOS sensors and use Bayer or non-Bayer pixel arrays.  The only common factor is that they all have pixel areas smaller than 4 sq microns.

Jimmy has kindly provided me with a copy of his recent chart test image from the listed Canon DSLR in the table.  This model has a full frame sensor with very large pixels (41.1 sq microns). What is very notable is that this chart shows very good colour rendition and resolution of all the coloured Es. Jimmy's image is copied below, with his permission:

This seems to support the conclusion that optical crosstalk, which is associated with small pixel size, is a major factor in the poor colour resolution observed for the camera models with smaller pixels.

It would be very interesting to know how the camera models of intermediate pixel size (> 4 but < 20 sq microns) listed in the table would perform using Jimmy's chart in relation to colour rendition and resolution.  These include the Panasonic GF series and Panasonic LX series.  Do we have any takers?

Ian

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