Canon PowerShot SD 4000 IS/IXUS 300 HS Review
Resolution Chart Comparison (JPEG)
Images on this page are of our standard resolution chart which provides for measurement of resolution up to 4000 LPH (Lines Per Picture Height). A value of 20 equates to 2000 lines per picture height. The chart is shot at a full range of apertures and the sharpest image selected. Studio light, cameras set to aperture priority (optimum aperture selected), image parameters default. Exposure compensation set to deliver approximately 80% luminance in the white areas.
What we want to show here is how well the camera is able to resolve the detail in our standard test chart compared to the theoretical maximum resolution of the sensor, which for the charts we shoot is easy to work out - it's simply the number of vertical pixels (the chart shows the number of single lines per picture height, the theoretical limit is 1 line per pixel). Beyond this limit (when talking about line pairs usually referred to as the Nyquist frequency) the sensor cannot faithfully record image detail and aliasing occurs.
This limit is rarely attained, because the majority of sensors are fitted with anti-aliasing filters. Anti-aliasing filters are designed to reduce unpleasant moiré effects, but in doing so, they also reduce resolution (the relative strength and quality of these filters varies from camera to camera). In theory though, a sensor without an AA filter, when coupled with a 'perfect' lens, will deliver resolution equal to its Nyquist limit. Therefore, even though it may be effectively unattainable with normal equipment in normal shooting situations, an understanding of a sensor's theoretical limit provides a useful benchmark for best possible performance. Nyquist is indicated in these crops with a red line.
|JPEG (3648 x 2736) 1.9MB|
|The resolution is good, if not great. These shots, taken at around 75mm equivalent, show very similar resolution to the similarly megapixeled Canon S90 but are some way behind the Samsung TL500.
Sharpening artefacts are clearly visible as the lines converge towards the camera's extinction resolution (the point at which distinct lines blend into gray). There's no sign of moiré interference patterns that can occur when image processing tries to eke-out too much ultra-fine detail.
Aug 2, 2010
May 11, 2010
Aug 2, 2013
Jul 30, 2013
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