Hello, is it possible that Pentax uses 16 bit because of the new multi exposure feature? To sum up the 12 bit data without loosing Information, you need more then 12 bits. If yes, it could be possible to reduce noise with multi exposures on static subjects, this is the same process which is used with filmscanners during multi pass scanning.
Martin MR> "tom" <[EMAIL PROTECTED]> wrote: >>> -----Original Message----- >>> From: Mark Roberts [mailto:[EMAIL PROTECTED] >>> >>> >>> "Peter Loveday" <[EMAIL PROTECTED]> wrote: >>> >>> >My only complaint is that the 12 bit data is padded to 16 >>> bit. This makes >>> >the raw file bigger than it needs to be; they are over >>> 12MB, where they >>> >should only need to be 9MB or so. This reduces storage on >>> CF, and slows >>> >write times, seemingly unnecesarily. If anyone at Pentax >>> is listening, >>> >please could we have non-padded PEF files? >>> >>> ISTR that the Canon 10D (6-megapixel) RAW files are also >>> 12MB - I think >>> it was Tom Van Veen who told me that and I wondered at the >>> time why they >>> weren't 9MB. (Am I remembering this correctly, Tom?) >> >>No, they're 6 megs. When converted to 8 bit tiff, they're 18 megs. >> >>I thought a raw file was a sensor dump, and the size of the file >>should correlate with the size of the sensor? MR> It should: 12 bits (1.5 bytes) per pixel for cameras that do 12-bit RAW.
