How do I change the aspect ratio on an image?

I'm attempting to upload wallpapers to Interfacelift.com but first I need to make sure they're in the correct aspect ratio and I need to upload multiple aspect ratios.

So, could someone tell me how to 1) figure out the aspect ratio, and 2) change the aspect ratio?

Thank you!How do I change the aspect ratio on an image?If you simply resize photos to certain ratios, you will be stretching and distorting the image, i.e. it will look terrible.



The only real way is by cropping to a ratio. Yes, you will lose a little bit of your image from one side in the process, but the rest of it will still look perfect.



To do that, you need an image editing program.



The very best is Adobe Photoshop CS4, but it is very expensive.



A more sensible choice might be Photoshop Elements (current version is 8), which is Photoshop's smaller cousin - can't do all the same things, but it is much cheaper and perfectly adequate for most people.



Another editing program you can get is the Gimp (free and legal). It isn't pretty, has a big learning curve, but is a great program. http://www.gimp.org/



Or you can go to these free websites, but that option is nowhere near as good as having the program on your computer: http://www.picnik.com or http://www.picture2life.com/ or http://fotoflexer.com/ or http://www.sumopaint.com/ or http://aviary.com/



The last two are your best bet for more complicated tasks.



In PS, look at Image, then Image Size - there you will see the number of pixels, then just do the math to figure out the ratio.

To change it, use the crop tool - specify the size you want, then crop.How do I change the aspect ratio on an image?Most photo editors have a resize function. You can resize by entering the number of pixels in the horizontal and vertical boxes. Here's a free program that resizes images and does very basic editing.

http://www.faststone.org/FSResizerDetail