Introduction to Image Resizing / Stretching Images
Image resizing / stretching images are some of the most commonly performed functions on images, especially if you're like me and have many photos and love to share them with friends, you often have to resize the image accordingly.
Sometimes if there is an image which you need printed on a big poster or something similar and you wish to blow up an image to a large size then you need to stretch it. However, while stretching an image like this, or while resizing an image as indicated above, care needs to be taken to ensure that the image does not get distorted and does not deteriorate in quality significantly.
The two key things to keep in mind are:
Aspect Ratio: Aspect ratio is the ratio of the horizontal to the vertical dimensions of the image. Some of the commonly used aspect ratios are 1:1 (120mm, Medium Format), 3:2 (35mm Film Camera), 4:3 (Digital Cameras, DSLR's) and 16:9 (HDTV, Widescreen)
Resampling: In digital imaging, resampling refers to the process of resizing an image / changing the resolution by the addition or removal of pixels.