I guess you mean to say the uploaded file size is 279 kb rather than 279 mb? The image properties says that the image is 683x1024 pixels and 149 kb. I am just trying to see what is wrong. For web uploading the best is to save and upload in sRGB colour space so that it appears similar in all browsers. However, I am not sure why the image becomes less. Also, can you please mail me the image and let me try to find out what is wrong.