Helpful Posts: Sorry about that. I've just changed it. Please give it a try and let me know what spreadsheet app. you use.Originally Posted by DanK
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Thread: Is it computer up-grade time
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11th October 2014, 05:33 PM #41
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Re: Is it computer up-grade time
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12th October 2014, 07:46 PM #42
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Re: Is it computer up-grade time
Chauncey, are you stacking 8 or 16 bit images?
Last edited by proseak; 12th October 2014 at 07:47 PM. Reason: fixed tyop, I mean typo
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12th October 2014, 11:52 PM #43
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Re: Is it computer up-grade time
They follow my usual protocol which is 16 bit.
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13th October 2014, 12:20 AM #44
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Re: Is it computer up-grade time
Try it with 8-bit images.
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13th October 2014, 02:45 AM #45
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Re: Is it computer up-grade time
Are you suggesting to drop down to 8 bit and then, when stack is finished go back to 16 bit?
Seems kinda counterproductive.
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13th October 2014, 09:30 AM #46
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Re: Is it computer up-grade time
Why if the 8bit images are "correct"? Originally Posted by chauncey
Are you suggesting to drop down to 8 bit and then, when stack is finished go back to 16 bit?
Seems kinda counterproductive.
John
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13th October 2014, 12:38 PM #47
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Re: Is it computer up-grade time
It's pointless, as Chauncey suggests. Most cameras, if I recall, actually record in 12- or 14-bit. If you convert to anything less than that, you throw out data. Assume 12-bit to be conservative. If you convert a 12-bit image to 8 bits, you discard 93.7% of the data. (12-bit is 2^12=4096 values; 8-bit is 2^8=256 values.) Converting an 8-bit file back to 16 bits doesn't find the discarded information and merge it back in. It just creates a bigger file. Originally Posted by ajohnw
I haven't done a timed comparison, but I think in the past I have stacked 8-bit images, and it did go a lot faster (as it should). So that is certainly an option, but once you go to 8 bits, that's where you are stuck.
In fact, if I remember right (I don't use the default settings, so I can't confirm), the Zerene Lightroom plugin will export the temporary files as jpegs, which are of course 8-bit and contain even less information than 8-bit TIFFs because of the compression.
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13th October 2014, 01:12 PM #48
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Re: Is it computer up-grade time
Thank you Dan for the explanation...this is a more visual example.
http://www.bing.com/videos/search?q=...DC1EF6B900458F
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13th October 2014, 01:29 PM #49
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Re: Is it computer up-grade time
that's a great example. Originally Posted by chauncey
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13th October 2014, 06:07 PM #50
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Re: Is it computer up-grade time
What do you plan to do after the stack?
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