Like Bayer sensors, the red channel can be in any of four positions (two are shown on the right). RCCC (Red-Clear-Clear-Clear) sensors In addition to the well-known Bayer CFA Imatest supports RCCC sensors, which are used in the automotive industry (where red has special significance).
The arrangement can be determined by examining a Bayer raw image file that contains recognizable colors with the Rawview utility, which can be opened from a button on the right side of the Imatest main window. There is no universal standard for mapping colors ( R, G, or B) to pixel position ( R mC n). The four possible pixel arrangements ( Red locations) are shown on the right, where pixel locations start with Row 1 Column 1 ( R1C1) at the upper left corner.
There are twice as many greens as reds or blues because the eye is most sensitive to green. The order of the colors is RGRGRG…, GBGBGB…, etc., in alternating rows. Bayer Color Filter Array (CFA) The pixels in most digital image sensors are covered with the Bayer CFA, which makes each pixel sensitive to a single primary color, Red, Green, or Blue. Imatestmodules can analyze raw files directly or after demosaicing. In this document, we sometimes refer to raw files from commercial cameras or development systems as Camera raw to distinguish them from Bayer raw files, which are standard monochrome image files that contain undemosaiced (Bayer) data. The unprocessed digital output of an image sensor is called RAW image data. Introduction – Using raw files – Bayer raw and RCCC files – LibRaw demosaicing (for commercial raw files)īayer frequency units – DNG files – Rawview utility – Generalized Read Raw (for binary raw files)ĭecompanding – Creating Synthetic raw images
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