Re: Raw picture reduction

Woody <usenet@xxxxxxxxxxxxxx> wrote:

Rowland McDonnell <real-address-in-sig@xxxxxxxxxxxxxxxxxxxxxxx> wrote:

Woody <usenet@xxxxxxxxxxxxxx> wrote:

Rowland McDonnell <real-address-in-sig@xxxxxxxxxxxxxxxxxxxxxxx> wrote:


you've got a lot of data and are looking for savings - fine. But 25MB
is still not a lot, for all that it'd useful to squeeze down `a big pile
of high quality images if you really need to save space'.

It is a lot, I have 650 of the files, so 16GB at 25M.

16GB is 320/16 or `only 5% of the disc space in question'.

5% of the disk space in question being 5 times larger than the free
space available!

Well, yes, that is the practical issue you are facing at the moment,
I'll admit that much. But 5% of the disc space ain't a big chunk in the
grand scheme of things.

Actually probably more, I got the file size down more than that
difference.

I've got a 20MB HDD. Yes, *mega*bytes - hooked up to my Mac Plus (well,
not actually plugged in at the moment - stuck at the bottom of the spare
room wardrobe as it happens).

I think we all do somewhere. The powerbook has a 40MB drive, and I have
a spare 20MB drive that I assume still works in my pile of things I
never look in and should throw in the skip

NOOO!!!!!! Stick it up on Freecycle or somehow give the kit away rather
than binning it. That's industrial archaeology, that is.

I have found sadly that it is much harder to give this stuff away than
to just bin it. The fact I still have it is becasue I cant bear to throw
it away.

I have a crowded house for the similar reasons.

[snip]

Come on, you saw the benefits of JPEG2000 in the example I sent, didn't
you?

I did. It was clearly a lot better, and that is what I was hoping for
with my tests.

But you didn't see it doing /your/ tests - well, in that case, how about
you install Graphic Converter and see what you can see using it to do
the conversions? Now we've had it confirmed that it'll deal with CR2s,
why not?

Elliots copy may open Cr2 files, mine doesn't. I just get a series of
grey blocks going up the screen. It doesn't complain about it, it just
doesn't seem to be able to do it.

Hmm - you got 10.6.4 with the latest Raw file importer updater?

The latest Graphic Converter?

If so, do a voodoo dance and you'll be sorted (prolly). Applejack AUTO
your caches clean, that's what I'd do.

[snip]

But the only things I can find on the subject doing quick Web searches
are patent-related so I'm damned if I can figure out what's what.

Ooh! Aside from this:

<http://www.cipr.rpi.edu/~choy/thesis.pdf>

which you might be able to make some sense out of, assuming you don't
mind Computer Modern Roman ;-)

Well, it is a format for 3D encoding, using some of the techniques of
jpeg 2000 blocks, but doesn't actually say what they are for (other than
preventing a memory overflow). However, it references the specs.

Presumably it is described in the documents for jpeg 2000?

ISO 15444 does not appeal to me as bedtime reading.

I get the option of 1024x1024 as
a default, and then at binary intervals down to 128x128.

I didn't play with them to see what they did.

FWIW, I see no such controls on Graphic Converter.

So my first guess is: Graphic Converter has a competent means of dealing
with tile block artifacts, while Photoshop's JPEG 2000 encoder hasn't.

Or photoshop has more control over it?

The two usually go hand in hand - if the automation's incompetent, you
need manual controls.

[snip]

Cocoa was a 1990s Apple thing - purely graphical. Smalltalk was a
1970s-originating thing, purely textual, and not for children.

Part of the origins of smalltalk was a language that was simple enough
for children to use.

That might have been some mad computer scientist's original idea, but
none of the examples of Smalltalk that I saw on the Wikip Smalltalk page
were suitable for anyone not working - these days - at least at degree
level (typically). They'd not attempt using anything looking like that
at GCSE. Maybe A level, for the serious students.

It is definately below o level stuff I would say

Show me an example, then. I can find nothing about Smalltalk which
indicates it's suitable for anything but advanced students with highly
developed language and writing skills.

[snip]

I put it to you that the typical ten year old on facing this sort of
stuff:

aRatherBigNumber := 42 factorial

or

Object subclass: #MessagePublisher
instanceVariableNames: ''
classVariableNames: ''
poolDictionaries: ''
category: 'Smalltalk Examples'

Oh no, we didn't do anything like that. This was way simpler.

Are you sure you're not getting Smalltalk confused with something
different, then?

[snip]

Modula-2 is a nice language for teaching. I did once start to learn
Pascal and that didn't bother me, so I assume even I'd get on with
Modula-2.

Pascal was used extensively for teaching in the US. For some reason, we
got basic.

Basic was invented in the USA for teaching. Pascal was used extensively
for teaching in the UK.

Basic is an appaling language for teaching.

I did say it was invented in the USA...

Some were better than
others, but still not a good example of a language.

But it lets numpties start programming almost immediately - there's
nothing easier to start programming with than something like a BBC
Micro.

I never met any pascal in any UK schools, or met anyone who did pascal
at school. One guy who did it at uni.

<shrug> IIRC, the only language I heard of being taught in schools and
6th form when I was that age myself was Pascal. Oh, and Fortran IIRC,
don't ask me why, I think that was someone's older brother.

[snip]

They do cooking at school.

Not generally, they don't.

Well, my daughter did - home economics
anyway. Maybe it is an option.

Hmm - home economics is generally not on the curriculum at all from what
I've heard. And what counts as `home economics' these days is nothing
like the genuinely useful home economics that my mother learnt when she
was young.

OK, well she did a lot of cooking and she only left school 6 years ago.

Not usual to have done a lot of cooking - btw, home economics done
properly is just that: home economics. Not /merely/ cooking, but the
cooking and entire household management shebang including money matters
and so on.

My mother had formal lessons in all that.

These days, I'd tell 'em, and give 'em a few tips on economical living
for the young (having been a student myself, I have more than a few such
tips) - but that was about ten years ago, and back then I was
uncomfortable about striking up a conversation with a couple of random
just-out-of-school-girls. Not that it's the sort of thing I do these
days generally, but I'm less bothered about talking to people.

There is little-or-no computer science education in UK schools that I
know of.

No, I was suprised to see what constitutes computer science education in
schools. I assumed it would be a lot easier now, but it isn't.

My point is that hardly anyone actually does computer science - mostly,
the kids just do `IT training'. Bash the use of a keyboard and MS
Office into their skulls to turn them into MS-slurping office-working
cabbages, that's the idea.

Oddly enough, it's not working out too well...

It doesn't even seem to teach them how to use office, it just puts them
off computing entirely.

<heh> So it's worse than I'd thought.

I read something recently.. oh yes;

<http://royalsociety.org/Current-ICT-and-Computer-Science-in-schools/>

Mmm.

Rowland.

--
Remove the animal for email address: rowland.mcdonnell@xxxxxxxxxxxxxxx
Sorry - the spam got to me
http://www.mag-uk.org http://www.bmf.co.uk
UK biker? Join MAG and the BMF and stop the Eurocrats banning biking
.

Relevant Pages

  • Re: Raw picture reduction
    ... includes decompressing a plurality of sets of compressed data, ... I see no such controls on Graphic Converter. ... Part of the origins of smalltalk was a language that was simple enough ... There is little-or-no computer science education in UK schools that I ...
    (uk.comp.sys.mac)
  • Re: Warning to newbies
    ... bragged that he's never taken a computer science class in his life ... coursework in computer science allows spending more of them on other ... coursework provides something of value, ...
    (comp.lang.c)
  • Re: substring finding problem!
    ... computer science to avoid being alchemy, ... what would be the case if %s was in the substitution string and would ... examples don't control the input. ...
    (comp.lang.c)
  • Re: subroutine stack and C machine model
    ... there was no computer science. ... Ben Bacarisse TODAY responded to a student who came to clc to get help ... which include Algol 68 and its overly permissive evaluation rules. ...
    (comp.lang.c)
  • Re: subroutine stack and C machine model
    ... Kolmogorov, Thomas Kurtz, Doug McIlroy, Marvin Minsky, John von ... Neumann, Alan Perlis, Claude Shannon, Alan Turing, and of course ... there was no computer science. ...
    (comp.lang.c)