Compress different parts of a pix by different amounts?

On Fri, 05 Oct 2007 06:18:33 +0000, mike wrote:

I don't know the proper terms, but here's the idea.
Take a big pix at high resolution (eg spectators at a football game).
Use a combination of pixel scaling and compression to
get a highly compressed picture, small file size, picture 1.
Print picture 1.
Print the original picture.
Take scissors and cut out small parts of the high resolution
(eg a face)
pix and glue them on Picture 1 in the right places.

Wanna do that digitally.

I want small file size. I want the big picture for context.
I want high resolution in a few small parts of the picture.
I'd like to render the picture on a windows PC without extra stuff.
Would be nice to be able to put the pix on a website and have
a standard PC browser render it correctly. I want it freeware.

Ideas?
Thanks, mike

Sounds impractical. In order to change compression methods on different
areas would require additional information on the technique for each area
- would probably lead to a bigger file than you started with.

Pat wrote:
On Oct 5, 2:18 am, mike wrote:
I don't know the proper terms, but here's the idea.
Take a big pix at high resolution (eg spectators at a football game).
Use a combination of pixel scaling and compression to
get a highly compressed picture, small file size, picture 1.
Print picture 1.
Print the original picture.
Take scissors and cut out small parts of the high resolution
(eg a face)
pix and glue them on Picture 1 in the right places.

Wanna do that digitally.

I want small file size. I want the big picture for context.
I want high resolution in a few small parts of the picture.
I'd like to render the picture on a windows PC without extra stuff.
Would be nice to be able to put the pix on a website and have
a standard PC browser render it correctly. I want it freeware.

Ideas?
Thanks, mike

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I suppose if you wanted the maximum result, you need to create two
layers. The bottom layer is the entire picture. Take that image and
reduce it's size (in dpi) but keep it the same position in your
software. Usually a screen is 72 dpi, so say, for the sake of
argument you reduce it to 36 dpi. That's 1/4th the size. Then take
the top (full resolution) image and cut out everything but the faces.
Then merge the layers and export as a jpg. I believe that will let
your compression software work better because you're gotten rid of
lots of detail.

Alternatively, you could set your colors in the "low res" area to, say
8 color, and keep the faces at full color and reduce the data that way.

Thanks, guys.
Jpg wizzard does the job.
Is it me or is the posting retention on this newsgroup about six hours?

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Return address is VALID!

I'm afraid PSPP X2 will not run on an old Win2K system.
%:(

Cordialement,
Jean-Luc Ernst
www.digigrey.com

"mike" a écrit dans le message de news:
tfrNi.63$d2.37@trnddc08...
Thanks, but 326MB download, $99 and HUGE system requirements put it
out of the range of feasibility. I'll build a system to try it,
tomorrow when the download finishes... just for fun, but it won't be
practical for me.

Anything lighter weight that will run in win2k available?
mike

On Fri, 05 Oct 2007 13:47:05 GMT, mike wrote:

JL wrote:
Paint Shop Pro Photo X2 (12) does it but not freeware.
And it creates the html code for including in the webpage.

Using PSP, you cut the image in rectangles and apply a different compression
rate to each different rectangle.

You may download the trial version (30 days) on www.corel.com. The trial
version is the complete version but limited in time.

Thanks, but 326MB download, $99 and HUGE system requirements put it
out of the range of feasibility. I'll build a system to try it,
tomorrow when the download finishes... just for fun, but it won't be
practical for me.

Anything lighter weight that will run in win2k available?
mike

PhotoLine 32, www.pl32.net It has the option to compress individual layers, or
portions by making them into new smaller layers, at whatever compression ratio
that you want for each layer. Then combine those portions to your advantage
using masks or mask brushes. Or use its adaptive-soften or adaptive-sharpen
filters. Each automatically leaving the other portions alone. Then compress
normally, the jpg algorithm normally applies more compression to the less
detailed portions.

There's lots of ways to do this using PhotoLine. But I find the web-export
feature to provide all the compression and detail retention that I require.

The huge added advantage is that for downsizing (before compression) it has
Lanczos-8 resampling interpolation. No details are lost or softened, like what
happens when using any version of PhotoShop or Paint Shop Pro with their
bicubic-only methods.

"mike" wrote

Is it me or is the posting retention on this newsgroup about six hours?

It's you, I think. I have two newsfeeds (free.teranews and
reader.news.telstra.net) and one has 2500 headers, the other 8500*.

You can subscribe to the Telstra one without a password - it's supposed to
be read only, but I'm posting this through them.

Paul

*That's several months worth.

You should try the NEW algorithm when downsizing with Paint Shop Pro Photo
X2. It produces now sharp images after downsizing (no soften nor lost of
details). It is an improvement compared to the previous versions.

Cordialement,
Jean-Luc Ernst
www.digigrey.com


"bradly-shanks" a écrit dans le message de news:
...

No details are lost or softened, like what
happens when using any version of PhotoShop or Paint Shop Pro with their
bicubic-only methods.