zoomed out image quality enhancement

[whirlpool6]

hello everyone,

image resize is really a hard problem. and our system deals with resizing images often with just a click of a button. the quality of zoomed out images are really bad on web browsers. i have been asking help from this site regarding this issue.

we have found a solution for this in ie7. i used image.style.msInterpolationMode = 'bicubic' and it really produces a readable zoomed out image... but this is not applicable in ie6. we tried a server side solution in php but it really is slow. we need a fast solution since this application zooms images with just a button click. ive tried searching for freeware plugins and activeX controls but found none.

please help me on this. i need your suggestions on how this can be done. any suggestion is greatly appreciated. our system uses php, css, and php and it only runs in internet explorer.

thanks a lot.

 

[BillyRayPreachersSon]

Client-side you're stuffed, as you've found out already. Probably your best bet is to create multiple versions of the image server-side at the different zoom levels you require (or steps in between if there are many) and pre-load those in the browser.

Hope this helps,
Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

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[whirlpool6]

dan,

thanks but i can't do this suggestion. if i'll do this, ill be stuffed with lots of images... our image size are approximately 2mbs. and zooming goes as low as 10% to as high as a thousand%.

is there somesort of a way to change the interpolation mode or resampling mode in ie6? there must be a way to deal with this.

thanks a lot.

 

[BabyJeffy]

is there somesort of a way to change the interpolation mode or resampling mode in ie6?

No.

...there must be a way to deal with this.

Why "must" there? Who says?

Someone may have developed an ActiveX plugin that achieves this, but it will definately be proprietary. I have never seen such a thing in the past 15+ years on the web (but I have never specifically spent my time looking).

Maybe you could process the lower resolution images server-side and create some "larger resolution" images "on the fly" using interpolation techniques. You could cache the files that are created server-side for subsequent requests for the same file. There are libraries that can do this available for PHP and Java (to my knowledge).

Cheers,
Jeff

[tt]Jeff's Blog [!]@[/!] CodeRambler

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http://www.coedit.co.uk/

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Make sure your web page and css validates properly against the doctype you have chosen - before you attempt to debug a problem!

FAQ216-6094

 

[whirlpool6]

wahhh... then this is a hopeless case... i have tried server side programming on this using php but it really is slow. this is why im looking for a client side solution....

does anybody know of an activeX for this? please help me...

thanks a lot...

 

[BillyRayPreachersSon]

Why not write one yourself?

Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

[tt]Dan's Page [blue]@[/blue] Code Couch

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[whirlpool6]

is it easy? i don't know how to... our server is linux but our clients are windows.

 

[BillyRayPreachersSon]

You'd need to ask in another forum - one for whatever language you would use to write it (c sharp, vbscript).

Dan



Coedit Limited - Delivering standards compliant, accessible web solutions

[tt]Dan's Page [blue]@[/blue] Code Couch

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[whirlpool6]

thanks dan...