by m.Th. (Posted Tue Jan 17, 2017 4:57 pm)
You cannot - sorry - and this isn't XnView MP's fault. PEFs are Raw (= the Raw data from sensor) which means that they are a „complicated” 12-bit data of separate R,G and B channels. Due of the intrinsic nature of Bayer sensors any program which reads Raw needs a special operation (called „demosaicing”) to get this bunch of bits in a classical 8,8,8 RGB format. To do the reverse and to inject the data in the (compressed) proprietary raw format among the proprietary maker notes/tags is a very complicated task which, till now, nobody allocated resources for.
Try to save in normal TIFF or PNG (or any other loseless format of your choice). Anyway, the XnView MP processing pipeline is 8 bit (like many other programs) and you will lose the 4 bits which (I think) you want.
You can use for these things a full-blown non-destructive Raw editor (for ex. Photivo or RawTherapee which are free) but they come with their own set of problems.
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And I would also like to save the RAW file, if I select auto brightness, I can only export into other format but not save into the RAW.
You cannot - sorry - and this isn't XnView MP's fault. PEFs are Raw (= the Raw data from sensor) which means that they are a „complicated” 12-bit data of separate R,G and B channels. Due of the intrinsic nature of Bayer sensors any program which reads Raw needs a special operation (called „demosaicing”) to get this bunch of bits in a classical 8,8,8 RGB format. To do the reverse and to inject the data in the (compressed) proprietary raw format among the proprietary maker notes/tags is a very complicated task which, till now, nobody allocated resources for.
Try to save in normal TIFF or PNG (or any other loseless format of your choice). Anyway, the XnView MP processing pipeline is 8 bit (like many other programs) and you will lose the 4 bits which (I think) you want.
You can use for these things a full-blown non-destructive Raw editor (for ex. Photivo or RawTherapee which are free) but they come with their own set of problems.
Read Main Topic