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When you take an image that is 100x100 and put it into an image tag and force it to 25x25 by using the height and width tags you are still loading the 100x100 image into the page and then the users browser resizes it.
This is bad for two reasons.
1, it uses more memory then is required and can really slow down page loads.
2, You are at the mercy of the browser, some browsers resize nicely, others not so much.
My advise to you is to create two versions of the images, a full size and a thumb size. Using a good image editor like PS you can create nice 25x25 images and use those for the thumbs. It is a little more work because you need 2 of every image but it is worth it in the long run in my opinion.
I am trying to display same image with different dimensions..it can be 25 by 40 or 60 by 50..depends on php script and need of webpage I am loading.
however,I would also like to know how to resize the image to a file..may be that will answer my next question to Demaestro
your opinion sounds good,but i don't know how to create thumb size from full size image using script..could you plz elaborate a little more with some code ideas ?
I also had the same problem a while ago now, and tried to work out the best way for this problem and I have to agree with Demaestro, I have taken the original image which was huge and reduced it to a main product size of 450 x 450 saved it then made another img, thumb which is 100 x 100
It has been a long drain but well worth making and saving 2 images as pics are a core part of my site.
I am glad that i'm not the only one doing it this way.