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One of the eye-catching features of the Sony a7R IV is its 16-image pixel-shift mode. This shoots four images centered around one position then shifts the sensor half a pixel sideways and takes another four, then another half pixel… until it’s taken 16 images. These 16 images can be turned into 240 megapixel images.
We’ve added pixel-shift images to our studio scene at several different ISO settings, along with a couple of real-world examples to our sample gallery showing both the 4-image demosaicing mode as well as the high-res 16-image mode. Just for good measure, we’ve added more standard images to the gallery as well.
Studio Scene
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Image Processing
We’ve processed the images in the studio scene using PixelShift2DNG, because it allows us to use our standard Adode Camera Raw processing to maximize comparability with other cameras in the scene.
It should be noted that Imaging Edge has a setting called ‘Px Shift Multi Shoot. Correction,’ adjustable in eleven steps between 0 and 1, that smooths some of the stair-stepping and chequerboard errors that can appear in the image. The shots in our test scene effectively have this set to 0.
Before making this decision, we compared this output with the results from Sony’s own Image Edge software. We’ve created a rollover that compares the PixelShift2DNG result to the Imaging Edge output with sharpening, noise reduction and Px Shift Correction minimized, and to the default Imaging Edge result.
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| DNG -> ACR | Imaging Edge Modified | Imaging Edge Defaults |
We’ve uploaded the Image Edge-combined ‘ARQ’ files to the studio scene, but you can download the combined DNGs here:
| 16-image files merged using PixelShift2DNG | |||
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Articles: Digital Photography Review (dpreview.com)