Line stretch might not look like much initially, but it’s a great way to make a stripy background or layout for your website, or make co-ordinating buttons and banners very easily.
Open up the image you want to stretch.
Make a new image that is the same width as the image you just opened, but a lot bigger in height (I’d say about 400-800 pixels bigger, depending on the size of your original image).
Paste your original image onto your new image. Right click the dotted shape on your Tool menu (the marquee tool), and choose Single Row Marquee.
Now on your image, click on the place you want to start stretching from (it should be somewhere near the bottom of your original picture).
Press Ctrl and hold whilst you press T. Now click the tiny grey square that just appeared and drag it down to the bottom of your image.
Press Enter on your keyboard, then go to Select > Deselect. Here’s mine: