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There are two distinct modes of still capture. In the Current Displayed Image mode the still capture only freezes the currently displayed image and lets you save it to a file. No sensor registers are affected.
In the Full Resolution Image mode DevWare will perform a still capture procedure on the sensor. It could involve changing the image size, using global shutter mode, activating a flash lamp and so on. On an SOC it would involve activating the still image sequence on the sensor.

Still Image Format

The software is transport-independent and supports parallel, HiSPi, and other interface types that don't even have a byte-wise representation.
MIPI is byte-wise, but the FPGA on the Demo3 parses the MIPI stream and unpacks the pixels. There is no way to get the MIPI stream exactly as it comes from the sensor.

RAW still files are always 8-bit, 16-bit or 32-bit per pixel. If the bit depth is not one of those values, then the smallest format big enough to hold the data is chosen and the data is in the least significant bits
This is how the data normally comes across from the device driver, and also has the advantage that it's easy to read with various software libraries and tools (Matlab, numpy, etc.).

For 20-bit depth, each pixel occupies 4 bytes, stored LSB first. The pixel value is in the 20 low bits.
For compressed formats, our software by default expands the pixels before saving the RAW file, so the RAW file has linear data.

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This dialog allows for override of settings that DevWareX usually determines on its own via reading sensor register settings.

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