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What is the difference between RAW and Bitmap. I thought Bitmap had no compression
by brcmthrowaway 1y ago
What is the difference between RAW and Bitmap. I thought Bitmap had no compression
- cfn 1y agoNo an expert here but RAW is the data generated by the sensor and requires some heavy processing before you can show it on screen. A bitmap is an image format (assuming you mean the BMP files).
- mkl 1y agoThey are different lossless image formats. What is called "raw" is quite a few different formats from different manufacturers, and they contain lossless image data from the camera sensor without significant postprocessing. They usually need some postprocessing to look "good". A "bitmap" is just pixel data, not a file format, but .bmp is a file format, which does support some compression, and usually won't contain raw camera sensor data but something ready to be displayed on a screen.
- Jaxan 1y agoA big difference is bit depth. BMP normally is 8bits per pixel per channel (colour). RAW is often more bits (say 10 or 12 or even more). This means you can adjust lighting without introducing banding and so on.
- _bent 1y agomost importantly a RAW file hasn't been demosaiced, ie instead of pixels of colors, it's a grid of scalar sensor measurements that, depending on the pattern (eg Bayer) each represent either red, green or blue intensity. since we only know one for each position in the image, the other two have to be interpolated (which is demosaicing)