Thumbnailing hi-res jpegs

Hi all,

I'm not sure if this is the right group for this, so if anyone knows a
better group, please let me know.

I have a web application that thumbnails hi-res jpeg's on the fly, up to
some 200-300 images at a time. It runs on ASP using VBScripts.
With the latest camera's, file sizes and 2GB cards the process is becoming
very slow. I have been looking around for a better component to use in my
asp pages. At the moment I am using 'dImage'. I have tried a few others but
they run at the same speed.

The process I am running creates small thumbnails and saves them to disk
before displaying them through the browser. This way if they are required
for view again the thumbnail does not have to be created again.

Using image browsing software produces fast thumbnails, why can I not find
something in a web component that will do the same.



Any help much appreciated.


Cheers, Blinky.

\
Mon Apr 10 11:25:15 CDT 2006

> The process I am running creates small thumbnails and saves them to disk
> before displaying them through the browser. This way if they are required
> for view again the thumbnail does not have to be created again.

I don't know what exactly you want to do, but large images can be displayed as
thumbnails simply by specifying the size in the IMG tag. For example, if you
have a 300x300 image that you want to display as a 50x50 thumbnail:
<img src=300x300.jpg width=50 height=50>

(You really only need one, either width or height, if you are going to maintain
the same proportions)

Here is a demo I wrote for another posted question which uses this technique to
display larger images as thumbnails:
http://crash.thedatalist.com/demo/demo.htm
--
Crash

"Character is doing what's right when nobody's looking."
~ J.C. Watts ~

roger
Mon Apr 10 16:08:05 CDT 2006


"blinky" <xxnospamxxweh@bigpond.com.au> wrote in message
news:%2315FiCKXGHA.4924@TK2MSFTNGP05.phx.gbl...
> Hi all,
>
> I'm not sure if this is the right group for this, so if anyone knows a
> better group, please let me know.
>
> I have a web application that thumbnails hi-res jpeg's on the fly, up to
> some 200-300 images at a time. It runs on ASP using VBScripts.
> With the latest camera's, file sizes and 2GB cards the process is becoming
> very slow. I have been looking around for a better component to use in my
> asp pages. At the moment I am using 'dImage'. I have tried a few others
but
> they run at the same speed.

2jpeg seems fast to me

http://batch.fcodersoft.com/2jpeg/

but costs $125. There is a free demo for download.


--
roger

Mike
Sat Apr 15 21:28:37 CDT 2006


"blinky" <xxnospamxxweh@bigpond.com.au> wrote in message
news:%2315FiCKXGHA.4924@TK2MSFTNGP05.phx.gbl...
> Hi all,
>
> I'm not sure if this is the right group for this, so if anyone knows a
> better group, please let me know.
>
> I have a web application that thumbnails hi-res jpeg's on the fly, up
> to some 200-300 images at a time. It runs on ASP using VBScripts.
> With the latest camera's, file sizes and 2GB cards the process is
> becoming very slow. I have been looking around for a better component
> to use in my asp pages. At the moment I am using 'dImage'. I have
> tried a few others but they run at the same speed.
>
> The process I am running creates small thumbnails and saves them to
> disk before displaying them through the browser. This way if they are
> required for view again the thumbnail does not have to be created
> again.
>
> Using image browsing software produces fast thumbnails, why can I not
> find something in a web component that will do the same.
>
> Cheers, Blinky.

A bit late, but better late than never I guess ... most of the image
browsing software (or set the options in windows to view
thumbnails) often uses the embedded thumbnail in most jpg files.
Be aware of the gotchya that I have run into -- many editors do
NOT update the thumbnail if you edit the image. I have run into
this a number of times -- edit the image, crop it, add text then
when I am looking for it via "thumbnails" it can't be found. The
thumbnail in the image was not updated by the editor - it still is
of the original image.

mikey

\
Sun Apr 16 07:04:32 CDT 2006

> A bit late, but better late than never I guess ... most of the image
> browsing software (or set the options in windows to view
> thumbnails) often uses the embedded thumbnail in most jpg files.

How do you display this embedded thumbnail with script?
--
Crash

"I often quote myself. It adds spice to my conversation."
~ George Bernard Shaw ~

Mike
Sun Apr 16 09:25:00 CDT 2006


""Crash" Dummy" <dvader@deathstar.mil> wrote in message
news:OdfCt3UYGHA.4620@TK2MSFTNGP04.phx.gbl...
>> A bit late, but better late than never I guess ... most of the image
>> browsing software (or set the options in windows to view
>> thumbnails) often uses the embedded thumbnail in most jpg files.
>
> How do you display this embedded thumbnail with script?
> --
> Crash
>
> "I often quote myself. It adds spice to my conversation."
> ~ George Bernard Shaw ~
>

Not sure, I have just run into the issue before. Not all
jpgs have them apparently, but the ones from digital
cameras do. There is a utility out there you can use to
strip them out which will then cause windows to calculate
the new one and display that so the "thumbnail" in your
folder view will match what the picture actually is. I
had just mentioned this since it is a sneaky one and can
be quite confusing the first time you run into it. See the
following link for some more info if you are interested:
http://www.sentex.net/~mwandel/jhead/ <- handy utility included

The thing that is confusing is not all pictures have them,
so if you edit two jpgs, one that has the embedded thumbnail
and one that does not, then look with a folder set to
"thumbnail view", one of the images will reflect your
edits, while the other will not show any changes.

mikey