eto ang ginagawa ko sana makatulong..
kung ang picture ay galing sa DSLR, and you want to post it on facebook or sent it thru email pwede ito, for viewing purpose and it will not affect the quality and you can still post it. But after the edit you cannot use the edited file again to edit ha kasi masisira na ang picture quality.
Open adobe CS3 or CS4
drag your image inside, once its open..
click image> image size.. then may dimension lalabas high and width equivalent to pixels on the right side, just adjust the top part to 1000 <--- tapos ung baba automatic na mag aadjust ng kusa sa equivalent value, then ok and save as!
at magiging 100kb and 5 - 10mb mong picture.
post it on facebook etc. enjoy!