I don't understand why you compare that with native Affinity documents file size. The content of the output PNG won't contain more relevant data then its input, the CR2.) which, by the way, was not at all about the CR2 development process, but about the increase in the developed, exported PNG file size compared to the undeveloped CR2. From this point of view, your hints confirm my view that compression is crucial here in this topics question. Pure bit depth does not result in variable file size, it is clear defined by an amount of pixels and channels. – My post was related to a note that the difference between the 95 MB and the 26 MB might result from different bit depth. This appears to be the answer again: compression. But manual adjustment may give you better results. If using the Serif Labs RAW engine, you can instruct the Develop Assistant to apply a Tone Curve, which should lighten things. Many other raw developers apply some default adjustments, rather than showing you the camera data directly. If you're on Windows, or using the Serif Labs Raw engine for your RAW development, its approach is to show you the actual raw data and let you adjust it as you want. But it would be good to know why the PNG files are so much bigger.īy the way, you mentioned earlier that the Affinity files are darker. (2) PNGs don't support compression natively, but TIFF does (and it's lossless, unlike JPG compression) so you might consider TIFF as an alternative. So the 8- vs 16-bit difference may not be the full explanation for your file size difference. (1) On a quick test I just did, a 16-bit RGB file took was only about 40% larger in PNG form than the equivalent 8-bit RGB file. (2) I've been using PNGs as a raw storage medium that's easier to access than CR2s, but if the file volumes are quadrupling - or even doubling - it changes the balance. (1) I find it surprising that moving from 8-bit to 16-bit would quadruple the file size doubling seems more logical.
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