MULTIMEDIA

Befriend Digital Zoom

9/7/2012 9:07:00 AM

Although digital zoom reduces image quality, in some cases it is the last resort.

Most travel cameras are integrated with digital zooming. Without adjustment, when turning optical zoom at maximum level, the camera will automatically switch on digital zoom.

Basically, digital zoom selects the image’s center then enlarges it by enlarging present image dots but not via optical zoom. After that, it crops the image at selected ratio. Because image dots are enlarged, resulted image has more split pixels and this effect becomes clearer when you zoom in more. Thus, the more you zoom in, the worse image quality becomes.

However, in some case you need a close-up shot and there’s no way to get closer, digital zoom is the last resort.

Description: Image with no zoom, wide-angle camera, 1/1000s shutter speed, f/3.1, ISO 80

Image with no zoom, wide-angle camera, 1/1000s shutter speed, f/3.1, ISO 80

Description: Using 10x optical zoom, 1/500s shutter speed, f/5.6, ISO 80

Using 10x optical zoom, 1/500s shutter speed, f/5.6, ISO 80

Description: Using digital zoom, 1/500s shutter speed, f/5.6, ISO 80

Using digital zoom, 1/500s shutter speed, f/5.6, ISO 80

The obvious result of digital zoom is that visual quality isn’t sleek. Especially, when enlarged, the picture will become unclear, sharp-less and worst pixelated. However, in new series having complicated algorithm and technology, this issue has been reduced to produce acceptable image quality if digital zoom is used at mediocre level.

Description: Image captured by wide-angle camera with1/550s shutter speed, f/4.0, ISO 100

Image captured by wide-angle camera with1/550s shutter speed, f/4.0, ISO 100

Description: Image captured via 30x digital zoom with 1/300s shutter speed, f/6.4, ISO 100

Image captured via 30x digital zoom with 1/300s shutter speed, f/6.4, ISO 100

Despite all, digital is just the last resort. If you prefer images with higher quality, consider cameras having high optical zoom. Present technology has allowed for up 35x optical zoom with over 800mm focal length.

 

 

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