smsouthers wrote:
What makes a picture so grainy looking?
I agree with the above posts. I would suggest the following tests, if you have not done something similar already.
1. Set your camera to ISO to 100. (in most circumstance this will mean no visible grain except at very large magnification.)
2. Set your camera to aperture f8 (big depth of field) and auto everything else. Let the camera take charge of exposure (speed).
3. Auto focus on a static large object: tree, wall, building, but be sure that everything important is on the same plane.
4. In ideal circumstances, shoot before 10 am or after 3pm to avoid overhead sunlight. Take your test photographs with the sun over you shoulder.
5. Check the first results on your computer. What you see is the best that your camera can do without your help. Do you like what you see? Is everything sharp? Is the exposure as good as you would like?
6. Repeat the exercise but increase the ISO to 400, then 800, again at 1600 until you reach the maximum ISO the camera will allow. (You may like to include a card in the picture with the ISO speed displayed on it to prevent confusion later.) At some point the ISO speed will produce unwanted noise. This is your top setting in good light. That same setting will produce more noise as the light gets dimmer.
7. Now you know what's happening when noise appears and you know when it is likely to appear. Of course you can reduce noise with a good photo editing program, but it's better to eliminate it in the first place.
You can vary the above: work out tests for depth of field for various lens you own, best aperature setting for a lens for the best result (usually around f8).
All this work will ensure that you know your camera, what it is capable of, and how you can improve the reults by taking charge of ISO setting, aperature setting, shutter speed, and focussing yourself.
The difference between an amateur photographer and a point and shoot happy snapper is that the photographer knows his/her equipment and how to use it. Maybe we'll talk about composition, lighting, rim effects, night photography, etc., later. Good luck.