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improper use of width and hieght?

 
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rocky

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Since: Jul 07, 2003
Posts: 56



(Msg. 1) Posted: Fri Aug 15, 2003 12:13 am
Post subject: improper use of width and hieght?
Archived from groups: alt>www>webmaster (more info?)

Sometimes staff on my site send me html reports for publishing, and I have
noticed that they use width and hieght to resize large images so they appear
as thumbnails. This isn't something I do, if I need thumbnails, I create
thumbnails and link them to the large image.

I am guessing that using hieght and width to resize images is not good
practise, but what exactly _is_ the problem with doing it that way?

Thanks.


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Rocky [ICQ UIN 41113560]
www.GhostRecon.net | www.AGR-S.com


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 >> Stay informed about: improper use of width and hieght? 
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eightninethree

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Since: Jun 28, 2003
Posts: 171



(Msg. 2) Posted: Fri Aug 15, 2003 12:13 am
Post subject: Re: improper use of width and hieght? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"Rocky" <Rocky RemoveThis @GhostRecon.net> wrote in message
news:bhgqi3$lrr0$1@ID-12072.news.uni-berlin.de...
 > Sometimes staff on my site send me html reports for publishing, and I have
 > noticed that they use width and hieght to resize large images so they
appear
 > as thumbnails. This isn't something I do, if I need thumbnails, I create
 > thumbnails and link them to the large image.
 >
 > I am guessing that using hieght and width to resize images is not good
 > practise, but what exactly _is_ the problem with doing it that way?
 >
 > Thanks.

When an image is resized smaller: the same amount of data is transfered.
So if it is a huge picture (size and data) but is resized to be smaller,
then you're making the visitor download more data than necessary.

When an image is resized to be larger: the picture looks like crap.


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Karl Core

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user104

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Since: Jun 28, 2003
Posts: 1662



(Msg. 3) Posted: Fri Aug 15, 2003 12:40 am
Post subject: Re: improper use of width and hieght? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"Rocky" <Rocky.DeleteThis@GhostRecon.net> wrote in message
news:bhgqi3$lrr0$1@ID-12072.news.uni-berlin.de...

 > I am guessing that using hieght and width to resize images is not good
 > practise, but what exactly _is_ the problem with doing it that way?

You tell me, you're the one who's raising it.

It can have advantages. It means the larger image is already downloaded, so
it appears instantly when the "thumbnail" is clicked. There is no need for
realtime image processing/manipulation.

It has its uses. NOT IDEAL for every situation.
--
Charles Sweeney
<a style='text-decoration: underline;' href="http://www.CharlesSweeney.com" target="_blank">www.CharlesSweeney.com</a><!-- ~MESSAGE_AFTER~ -->
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ngx

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Since: Jun 28, 2003
Posts: 578



(Msg. 4) Posted: Fri Aug 15, 2003 12:42 am
Post subject: Re: improper use of width and hieght? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

Rocky wrote:
 >
 > I am guessing that using hieght and width to resize images is not good
 > practise, but what exactly _is_ the problem with doing it that way?
 >

resizing smaller:
o Browsers are not very good at it.
o Larger file size means longer download

resizing bigger
o Never works

Assuming one has used a fluid design for the page it is trivial to replace
one illustrative image with another even if they are slightly different
sizes/aspects - surrounding text will re-flow to suit the new object. Note:
this may cause some 'jumping' as the page loads and for this reason leaving
out width and height is a no-no for some designers.

Possible solutions include:
o Ignore the issue - optionally buy more transfer allocation and leave your
visitors staring at an empty hole while they wait.
o Replace your co-workers with staff already competent in the mysterious
arts of image manipulation
o Train your co-workers to the required standard
o Use a server side module/component to resize the images.
o Stop using images.

--
William Tasso - <a style='text-decoration: underline;' href="http://WilliamTasso.com" target="_blank">http://WilliamTasso.com</a><!-- ~MESSAGE_AFTER~ -->
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rocky

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Since: Jul 07, 2003
Posts: 56



(Msg. 5) Posted: Fri Aug 15, 2003 1:38 am
Post subject: Re: improper use of width and hieght? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"EightNineThree" <eightninethree.RemoveThis@REMOVEeightninethree.com> wrote in message
news:bhguco$qb5$1@ngspool-d02.news.aol.com...
 > When an image is resized smaller: the same amount of data is transfered.

There's a good reason to make thumbs then Surprised)

Thanks.


--
Rocky [ICQ UIN 41113560]
<a style='text-decoration: underline;' href="http://www.GhostRecon.net" target="_blank">www.GhostRecon.net</a> | <a style='text-decoration: underline;' href="http://www.AGR-S.com" target="_blank">www.AGR-S.com</a>


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user178

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Since: Aug 15, 2003
Posts: 4



(Msg. 6) Posted: Fri Aug 15, 2003 11:59 pm
Post subject: Re: improper use of width and hieght? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"Rocky" <Rocky.TakeThisOut@GhostRecon.net> wrote in message
news:bhgvga$nc6j$1@ID-12072.news.uni-berlin.de...
:
: "EightNineThree" <eightninethree.TakeThisOut@REMOVEeightninethree.com> wrote in
message
: news:bhguco$qb5$1@ngspool-d02.news.aol.com...
: > When an image is resized smaller: the same amount of data is
transfered.
:
: There's a good reason to make thumbs then Surprised)
:
: Thanks.
:
Too right!!
The whole point of thumbs is that they are small and quick to download
and display.
Imagine a page of 50 images, HTML code aside:
* each image is 2kb (thumbnail) - total download is 25kb - that's
acceptable, even to a low bandwidth browser
* each image is about 100kb (full size reduced to thumb) - total
download is about 5,000kb, go make a cup of coffee while you're
waiting!!!

In the second instance, your potential customer would be on another
site before the download completed, and they won't be coming back in a
hurry!
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