TIFF-files

In article <460ac256$0$30091$4d3efbfe@news.sover.net>,
edjh <edjhann.RemoveThis@hotmail.com> wrote:

> Right, usually. Did some testing at work a couple years back and found
> that for some reason some tiffs with LZW compression were actually a bit
> larger than without. No idea why. Most were smaller.

16-bit images will generally be larger with LZW compression. There is
sufficient noise in the least significant bits of a typical 16-bit image
that most compression techniques won't work very well.

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 >> Stay informed about: TIFF-files 

In article <NUcOh.18588$_a1.15366@bignews7.bellsouth.net>,
"KatWoman" <XXXJoliePrincessKatanaXXX.DeleteThis@hotmail.com> wrote:

> I have never tried compressing my TIFF's as I was not sure about it
> the Mac-Win option does not seem to matter either, both open just fine on
> either box?

The "Mac/Windows" option is misleadingly named. It should be named
"Intel-type CPU" and "all other CPUs"...and even that does not really
matter.

The "Mac/Windows" option sets the byte order for the file. Intel
processors read data in what is called "little-endian" format; for every
group of bytes, the least significant byte comes first, then the most
significant byte.

By way of analogy, think about what would happen if you took years and
swapped each pair of numbers, so that you would say "9214" instead of
1492." Or if you wrote a check for a thousand dollars by writing "$0010"
instead of "$1000."

That is the way Intel processors read data, because for various
engineering reasons it made designing the first 16-bit processors to be
backward compatible with the ancient 8=bit 8080 processor easier.

A picture to a computer is nothing but a long string of numbers. When
you choose "Windows" in your TIFF dialog, the computer swaps around
every pair of numbers with the pair of numbers next to it when it saves.
So if your picture is represented by the numbers

1056720132456699

then choosing "Windows" in the TIFF dialog will cause your computer to
write

5610017245329966

to the disk.

Any reasonably intelligent program should be able to read a TIFF written
either way.

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m...bos <maart.ridd.DeleteThis@hccnet.nl> wrote:

> I am working with TIFF-files in windows XP and photo-shop. When there are
> lot of them, aspecially, in Windows XP it works ferry slow. Is there method
> to let it work quicker, as quick as JPG- files?

It's probably slowing down due to the number of images you have open,
rather than the fact that they're TIFFs. Note also that TIFFs can
contain 16-bit color, which means they take up at least twice as much
memory.

The method to make it work more quickly is to either a) Not open lots of
memory-hungry images, or b) add RAM, and get a bigger swap disk, or c)
all of the above.
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