iZoom, FZ200, LX7, FastStone - a few thoughts

Started Apr 10, 2013 | Discussions thread
Detail Man
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Re: iZoom, FZ200, LX7, FastStone - a few thoughts
In reply to Ronomy, Apr 11, 2013

Ronomy wrote:

DoctorJerry wrote:

Nice comparisons BUT for me I would rather try EZ ZOOM first.  The extended range youreducing just cropping out the central portion of the sensor ( goingdown from 12 mp to 8 or 5mp) gives better results than any of the digital zoom variations in my opinion.

I used 3mp and 5mp EZ Zoom a lot with my FZ8 and FZ38 and that was my start point for looking at iZoom.

With the FZ200, 5mp EZ gives me 37.5x zoom and a 5mp file.  iZoom at 37x or 48mp or whatever between 24x and 48x gives me a 12mp file.

That would be meaningless if it gave inferior quality, but the iZoom pics I have shown here compare very favourably with the 24x normal zoom pics, it seems to me.

It seems that it does not just insert extra pixels, the iResolution is said to balance noise and sharpening. But I don't know the technology of it.

Mike

My problem with EZ zoom is when less than 24x you files are a lower res than the sensor. Why throw away resolution when you have izoom to keep using 12MP from 25mm to 600mm?

EZ Zoom uses sensor-cropping in combination with optical zoom, and only in some situations down-samples the recorded images. I-Zoom and Digital Zoom use the sensor-cropping and up-sample the result to larger pixel-sizes.

Up-sampling does not restore sensor resolution lost due to sensor-cropping, whatsoever ...

What counts is which approach is reducing loss of sensor resolution the least by minimizing sensor-cropping for the same composite Zoom Factor. Reduced sensor resolution is worse than down-sampling - because it limits the image-data gathered in the first place, whereas down-sampling is able to include the image-data gathered by the image-sensor (in the process of interpolation followed by anti-alias filtering followed by decimation to lower pixel-resolution).

Plus you get cropped raw files with izoom if you want to shoot raw.

Granted. It's too bad that Panasonic does not allow the same for EZ Zoom (and Digital Zoom?).

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