jpg optimization

Hi,

Someone I work with told me that a jpg can be best optimized by cutting it into bits that are 64x64, 128x128, etc. I would like to read more about this. Can anybody direct me to a good source that can explain how it works, and how best to cut up an image that isn't one of these sizes? (In theory if I wanted to make lots and lots of 2x2 and 1x1 jpgs, is that best for a rectangular image that doesn't meet the 64x64 size requirement, or do I just cut the biggest 64-square piece out of it and then make rectangles out of the rest)?

Thanks
LauraS.

Laura,

I'm not sure if you'd actually end up with fewer kb overall, but it would probably appear to load faster because the "chunks" would appear quicker as opposed to waiting for the whole picture.

For software that helps you automatically cut up a larger image, try CoffeeCup Image Slicer. URL

Beth

By Slicing the image you can often optimize a section of the image that contains less colours than the rest of the image or reqires less detail, this can greatly reduce the load time if used well, especially in large images.

As for 64x64 etc I see now reason why those exact sizes would be any advantage?

Bana