Zooming in on an image

[Yves COPPE]

Le 26 mai 05, à 05:15, Ben Fisher a écrit :

> I'm wondering what is the most efficient way to resize a large image.
>  I'm trying to create a "zoom-in" effect by displaying a 600x800 image 
> and
> then slowly increasing the dimensions of the image (while still 
> keeping the
> image centered on the screen). Ideally this would be smooth and non-cpu
> intensive.
>  I wrote some code to do this. However, the results look awkward at 
> best. At
> first, the zooming in is rapid, but then it slows down. After a while 
> (when
> the zoom factor is about 4), the computer is bogged down and the image
> change is very slow and jerky. I would like to keep the rate even, 
> although
> I will not know the processor speed of the client's machine. It is
> disheartening to me to see the performance so lousy on a Pentium 4 3.0 
> Ghz.
>  Does anyone know a better way to "zoom in" images? It shouldn't be so
> processor-intensive - I tried "Preview" in WinXp and images easily 
> zoom in
> and out without any lag.
>  -Ben F
>

Look at revOnLine : so smart software from Eric Chatonnet :  #001 : how 
to magnify image

Hope this helps

Greetings.

Yves COPPE
yvescoppe at skynet.be