Image dimensions in pixels can be set in your camera. I suggest using the largest size images your camera settings will allow, and then resizing them on your desktop. But even if you set the camera for images of a "internet friendly" setting, like 640 x 480, the file size will be very large because the data density, expressed in dots per inch (dpi), will be 200 dpi or better. If you merely resize the image to reduce the file size, leaving the file it in its original data density (dpi) the image will have to be very small to reduce the file size to 200 KB or less.
As John mentioned, you can reduce the data density, or resolution, also sometimes called picture quality, in the camera settings. Just like my recommendation for picture size, I recommend using the highest picture quality settings your camera is capable of taking, and compressing the resolution on your desktop.
A high resolution image file must be "compressed" to reduce the dpi from 200+ dpi to 72 dpi, another internet standard. At 72 dpi, an image can be approximately 800 pixels x 800 pixels and still be 200 KB or less (that is why I selected 200 KB as a maximum file size). This takes two steps, first resizing the image, then using "save as" to save the file as a new compressed JPEG image.
(1) Upload the image files from your camera to your laptop or pc,
(2) Open the image file with editing software
(3) resize the image, 640 pixels in width is a fairly standard size for the internet, but I don't mind people uploading pictures that are 800 pixels in width either.
(4) use "save as" to save the smaller edited version of the image while retaining the original large file too. When you use the "save as" function, and select JPEG as the file type, the image resolution is normally set to compress it to 72 dpi.
If all you ever intend to do is use your pictures on the internet, the most direct route to produce the pictures you need would be to set the camera for 640 x 480 pixels and 72 dpi picture quality (resolution), but that limits you to what you can do with the pictures. That's why I think its best to set the camera for the biggest image files it is capable of making, and then editing them to suit your use.
-G
