SIGMA

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Key Feature of SIGMA dp2 Quattro

Equivalent to 39 megapixel high resolution

The SIGMA dp2 Quattro incorporates a newly developed Foveon X3 direct image sensor which features a pixel ratio of 1:1:4 from the bottom, middle to top layer. While the top layer captures both brightness and color information, the middle and bottom layers capture color information only. During the image data processing stage, the brightness data captured in the top layer is applied to the top, middle, and bottom layers, resulting in brightness and color data for each individual pixel. When measuring with a standard monochrome resolution chart, the dp2 Quattro has high resolution equivalent to approximately 39 megapixels. The Foveon direct image sensor, which uses superior vertical color separation technology, does not require a low-pass filter as there will be no false colors in principle, resulting in high-definition, 3D-like photographs with outstandingly rich color detail.

SIGMA dp2 Quattro : SUPER-HIGH size processed in SPP6

SIGMA dp2 Quattro : SUPER-HIGH size processed in SPP6

36 megapixel sensor camera

36 megapixel sensor camera

Overexposure Correction

The SIGMA dp2 Quattro incorporates a new overexposure correction function. This function is to minimize blown-out highlights caused by overexposure on JPEG data, based on the gradation information obtained through the arrangement of pixels on the sensor. Moreover, such gradation information can be utilized in expansion of dynamic range by processing RAW data. For example, when sky is blown-out as shown in the pictures below, the color of sky will not change much by applying overexposure correction in SIGMA Photo Pro 6. In such a case, by moving the exposure slider to the minus side, and then with overexposure correction, blue sky can be reproduced. Moreover, by moving X3 Fill Light slider to the plus side to brighten the darkened part enables the reproduction in a state closer to that seen with the eye.

 Overexposure Correction OFF

SIGMA Photo Pro : Overexposure Correction OFF

 Overexposure Correction ON

SIGMA Photo Pro : Overexposure Correction ON



Exposure slider -2.0, Overexposure Correction OFF

SIGMA Photo Pro : Exposure slider -0.8,
Overexposure Correction OFF

Exposure slider -2.0, Overexposure Correction ON

SIGMA Photo Pro : Exposure slider -0.8,
Overexposure Correction ON

SIGMA Photo Pro : Complete by adjusting with X3 Fill Light

SIGMA Photo Pro : Complete by adjusting with X3 Fill Light

Notice for when photographing a backlit scene

When photographing a strong light source such as sunlight directly, flare and ghosting may occur as shown below. In such a case, by processing the image through SIGMA Photo Pro 6, it is possible to make it less visible. Using the fringe correction function during processing has an even better effect. At that time, it is necessary to use color adjustment function to adjust color as saturation may be lower.

JPEG images on camera body

Adjusted in SIGMA Photo Pro

Occasionally, among green flare caused by a backlit environment, picture elements for overexposure correction might appear. In such a case, processing the image through SIGMA Photo Pro 6 will make it less visible.

JPEG images on camera body

Processed in SIGMA Photo Pro

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