How do I change a digital picture from 778kb (1224 x 1632) pixels to 150kb (640x840) pixels?

There are several options. If you have Photoshop or any photo editing software (usually included with your camera), you can choose the 'resize' option.



Another basic option would be to use Paint (it's in your computer under accessories) and use the Image menu choice. From there, choose Stretch/Skew and enter 20%. It will reduce your image to the approximate size you need. You may have to tweek the % to find the exact kb size you need. While there, you can also crop the image, if needed.



Here's a link to several free resizing programs, if you need one.

http://www.download.com/3120-20_4-0-1-0.



In any case, do a SAVE AS for your converted file giving it a new name, so your original file will remain intact for future use.



Hope this helps.How do I change a digital picture from 778kb (1224 x 1632) pixels to 150kb (640x840) pixels?
That actual size of the file is dependent on two things. The size of the image measured in pixels, cm or inches and the DPI assigned to it first by the camera and then later by you.



The procedure in Photoshop to resize the image for use as email or post on a website is to first set the DPI to 72 and then adjust the image size (in your case 640x840) and save the new image under a new file name so you don't destroy your original.How do I change a digital picture from 778kb (1224 x 1632) pixels to 150kb (640x840) pixels?
It would help you get a better answer if you click on the pencil icon under your question and ';Add details'; to tell us what software you are using so that someone can give you specific directions.