Resize/crop/pad a picture to a fixed size

Question

I need to resize a picture to a fixed size. But it has to keep the factors between the width and height.

Say I want to resize a picture from 238 (w) X 182 (

Answer 1

The technique is to:

1. resize the image so that one dimension matches while the other exceeds the desired dimensions
2. take out the desired size image from the center of resized image.

Lastly if you are puzzled about how to do the resize math, remember that if proportions of source and destination images are same, this relation holds:

SourceWidth / SourceHeight = DestinationWidth / DestinationHeight

If you know three parameters, you can calculate the fourth one easily.

I wrote an article about this:
Crop-To-Fit an Image Using ASP/PHP