Re: Low resolution issuew
If you could post some examples, maybe we can help you a bit better. It could be that they may be out of focus, that the camera was compensating for different lighting(higher noise w/ higher iso or something of the like) or may other things.
Photos speak 1000 words. :-)
Re: Low resolution issuew
What is the resolution of the images that are too low? Were they shot in low light? Do you have the camera set for auto ISO? Auto ISO and low light is the only way I can think of that there might be variations in resolution from image to image. Otherwise, you'd have to actually change the resolution and it would likely stay changed.
Re: Low resolution issuew
The resolution of the photos are set in the camera's menu. For best results you need to set the resolution to the largest size and the JPG to the Fine or Normal setting, (the best is RAW or TIFF). But be aware that you may need a larger memory card as these settings the photo file size is much larger that the lower resolution and higher JGP compression settings.
Re: Low resolution issuew
You mean the prints were low res. It is probably the processing. Where did you take it? Sometimes you can ask for the highest resolution (which still isn't that great).