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Image Adjustment

Posted on 2006-11-30
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Last Modified: 2010-04-06
Hi,
I'm using asp.net 1.1

I have an Image and
Image width is            468  
My Screen width  is     800

How can I adjust this image   so that  it fit to  the size of Screen (i.e. 800)  without loosing its    effects.
Image Adjustment accoring to screen width.

Awaiting ur kind guidance.

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Question by:sohrabus
5 Comments
 
LVL 5

Expert Comment

by:dasmaer
ID: 18044551
To keep the dimensions of the original image you need to increase the size of the height as well as the width.

In your case you increase width from 468 to 800, which is a mulitplier of 1.709401709 (800/468).  So you need to increase your height by the same value:

new_height = old_height * (new_width/old_width)

You then put these values into an img tag like: <img src="afile.jpg" width="<%=new_width%>" height="<%=new_height%>">

Hope this is what you're looking for.

D
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LVL 8

Expert Comment

by:tncbbthositg
ID: 18049124
How are you going to get the screen width?  I think this is a job for javascript.

you should use:

<img src="afile.jpg" onload="resize(this);" />


Then, you should have this in between your head tags:
<script type="text\javascript">
function resize(oTarget)
  {
    oTarget.height *= window.innerWidth / oTarget.width;
    oTarget.width = window.innerWidth;
  }
</script>

Or something like that.

TNC
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LVL 5

Expert Comment

by:cwickens
ID: 18055679
what do you mean by "without losing it's effects"?  if you mean becoming pixelated, that will happen unless the image is a vector image.  this will become even more evident if there is a user who visits the site with a higher screen resolution and views the page at say 1400x1050.
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Author Comment

by:sohrabus
ID: 18058874
Dear boses,

Thanks for ur kind support.
I'm able to    fit   IMAGE  according  to screen width. whether it its width is 800 px or 1024 px.

BUT if  IMAGE  of  468 px   is STRECHED  to 800 px    its effects (resolution) gets disturb.   it does not look good.


Dear cwickens,    
without losing it's effects -  I want my Image look good whether  width is 468 px, 800 px or 1024 px.

Awiting ur kind advice.
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LVL 8

Accepted Solution

by:
tncbbthositg earned 250 total points
ID: 18061107
Then create the image so that it looks good at 1024.  It'll look better resized down than resized up.  The problem is that big images take a long time to download.

TNC
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