lossless compression of still images - recommendations?

Robert Heller heller at deepsoft.com
Sun Feb 19 02:33:44 UTC 2017


At Sat, 18 Feb 2017 21:11:59 +0000 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:

> 
> On 17 February 2017 at 21:11, Robert Heller <heller at deepsoft.com> wrote:
> > Use tar+bzip2.
> 
> I thought that the OP meant that he wanted to compress the series of
> images, making use of the fact that they are little changed from one
> image to the next. Much like video is stored.

That is what tar+bzip2 will do. Bzip2 will see that two "adjacent" images are
90% (or whatever) the same. It will store a token for the each of the "same"
parts of the images -- that is, storing the "same" parts once. That is how the
*zip programs work. The OP can collect some number of images (maybe a day's
worth) and the tar/zip them on a regular basis (daily).

> 
> Colin
> 
> >
> >
> > At Fri, 17 Feb 2017 10:48:16 -0800 "Ubuntu user technical support,  not for general discussions" <ubuntu-users at lists.ubuntu.com> wrote:
> >
> >>
> >> I'm making a long series of exposures of a landscape where there will be
> >> only very small (but potentially significant) changes from frame to
> >> frame. Basically I'll take a 5MP image every 5 seconds for a year, I'll
> >> want to timestamp the images and keep them all for later
> >> post-processing, as well as being able to retrieve the image closest in
> >> time to a specified time and date of interest (which I can't predict.)
> >>
> >> I want the retrieved image to be faithful to the original, so I'd like
> >> to minimize storage needs by compressing the mostly unchanging parts
> >> (the landscape won't be moving much.)
> >>
> >> Does anyone have a recommendation for a program to do this?
> >>
> >> Dave
> >>
> >>
> >
> > --
> > Robert Heller             -- 978-544-6933
> > Deepwoods Software        -- Custom Software Services
> > http://www.deepsoft.com/  -- Linux Administration Services
> > heller at deepsoft.com       -- Webhosting Services
> >
> >
> > --
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-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Custom Software Services
http://www.deepsoft.com/  -- Linux Administration Services
heller at deepsoft.com       -- Webhosting Services
                                                                



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