"poor white balancing" ?
"file compression" ?
Sounds like BS to me, please explain.
On digital cameras white balancing is important to obtain natural colours. Without getting into details of why it is necessary, you do it by focusing your camera on a pure white object (a sheet of paper will generally do just fine) and adjusting the white balance on your camera until the white paper looks white in the photographs/video footage as well. Most digital cameras now have automatic white balancing, but they don't always work well (hence I usually check and adjust myself before doing anything important).
I specified digital cameras because previously this was a feature of the film used - for example, tungsten film which is used most commonly for indoor photography where incandescant bulbs (with a tungsten filament) are used for lighting. Using regular film for this produces an orange-yellow cast where objects should be white. If you are interested I have some example photographs sitting around that I could scan in and show you. I took them when I was dating a graphic design student and was teaching her some basic photography. I took one photo using 400ASA daylight film in her room (which was lit with fluorescent lights), using a Canon EOS 500 if I remember correctly (and there is a chance that I don't), and then I took another photo from the same position with the same lighting, but using a fluorescent light filter to colour adjust.
I take that back. I can't find the photgraphs, which means that she probably has them, which means I'm not going to go get them.
But, I was doing tests on a video camera a few nights ago and I have the footage from that (which includes cycling through the colour temperatures to white balance for a fluorescant light). If you are interested I can probably post that (for anyone who is interested)...would I have to post at YouTube first and then put in one of those YouTube links people post here to do that?
As for file compression...well, there isn't too much I can say on that. Unless you're working with a camera that captures RAW image files, the second you take your photo you are already working with a compressed image (usually a JPEG - some cameras capture TIF files, which are much better quality and not compressed as much but also take up a hell of a lot more memory). And file compression will often change colours in a photograph (not dramatically, usually), or at the very least make them unclear. Resaving JPEG files, or converting between different file formats will exaggerate this effect.
So no, it is not BS as all. Anything you are still unclear about?