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Pentax RAW file size
Hey all... getting closer to purchasing a *istDS, but I'm a bit troubled by a
design choice of Pentaxs'. It would appear that the RAW file size is *HUGE* by comparison to other brands. I've heard rumors that they both pad the 12-bits off the A/D to 16 bits, AND don't do compression. It would seem like a silly thing to not do a lossless compression on the RAW files unless computational power was an issue. Can anyone confirm or deny such a thing? I've been scouring the 'net looking for a sample RAW .PEF file to look through, but haven't had any luck with that either. If it is too difficult to compress on-the-fly at the time of the shot, at least a "pack photos" option or something would be a very good upgrade to the firmware. One could let the camera chew on the already taken pictures and crunch them down to 50% of their original size to fit 100 pics on a 512MB card, rather than 45. Anyone care to comment? -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
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John Bean wrote:
: The DS file is about 10MB, about 3MB smaller than the D. : Both include full resolution JPEGs within them along with VGA and thumbnail : sizes. Plus the sensor dump of course. They've got *full-resolution* JPEGs in them? That's pretty significant then.... seems like that should be an option, not enabled all the time. Hrm... no accounting for taste, I guess. -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
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John Bean wrote:
: The DS file is about 10MB, about 3MB smaller than the D. : Both include full resolution JPEGs within them along with VGA and thumbnail : sizes. Plus the sensor dump of course. They've got *full-resolution* JPEGs in them? That's pretty significant then.... seems like that should be an option, not enabled all the time. Hrm... no accounting for taste, I guess. -Cory -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
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John Bean wrote:
: Nothing to do with taste, it's a good design feature. It's used for quick : high-resolution reviewing and scrolling of the image on camera without : having to reprocess the raw data every time. I don't disagree that's it's a nice feature to have, I just don't agree that it should be mandatory. I managed to find a couple of sample PEF files online and did a little hexdumping. I found the three sizes within the PEF file of size 10000kB 160x120: 8kB 640x480: 40kB 3008x2000: 912kB That's 10% worth of overhead on every shot. It's a fairly compressed JPEG too, so it's probably not the same one you'd get if you shot in JPEG. I think it'd be better to have an option to include big JPEG or not and have it be the same high-quality one as if shot JPEG. -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
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John Bean wrote:
: Nothing to do with taste, it's a good design feature. It's used for quick : high-resolution reviewing and scrolling of the image on camera without : having to reprocess the raw data every time. I don't disagree that's it's a nice feature to have, I just don't agree that it should be mandatory. I managed to find a couple of sample PEF files online and did a little hexdumping. I found the three sizes within the PEF file of size 10000kB 160x120: 8kB 640x480: 40kB 3008x2000: 912kB That's 10% worth of overhead on every shot. It's a fairly compressed JPEG too, so it's probably not the same one you'd get if you shot in JPEG. I think it'd be better to have an option to include big JPEG or not and have it be the same high-quality one as if shot JPEG. -- ************************************************** *********************** * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * ************************************************** *********************** |
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#10
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"John Bean" wrote in message ... On Wed, 5 Jan 2005 20:33:31 +0000 (UTC), wrote: John Bean wrote: : Nothing to do with taste, it's a good design feature. It's used for quick : high-resolution reviewing and scrolling of the image on camera without : having to reprocess the raw data every time. I don't disagree that's it's a nice feature to have, I just don't agree that it should be mandatory. I managed to find a couple of sample PEF files online and did a little hexdumping. I found the three sizes within the PEF file of size 10000kB 160x120: 8kB 640x480: 40kB 3008x2000: 912kB Yes, that's what I told you initially though I didn't bother quoting the number chapter and verse, but thank you for confirming my facts. If you don't like the way it works tell Pentax, not me. Personally, I like it the way it is. Memory is cheap, convenience is worth more. Maybe disabling the embedded jpeg will be in the next firmware, or perhaps in the next Pentax dSLR. |
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