1) What are some photographic effects that can be achieved using digital or analog (darkroom, film, lights etc) technology?
By using some functions, we can change the colors of the photos. With a click on "Black & White" function, the photo can turn into Black and white. It can help change/remove imperfection to suit user's taste.





When we look at this photo, we can see that woman's face has been shapen and the photo is lighten. So by using digital technology, we can male the photo as good-looking as you can.

For analog technology, tit can change the light effect of the orginal setting.





In this photo, we can see that the photogragher has used darkroom in this photo. The four corners are dark, and the bottom part is darken. The whole photo only focuses on the red ballon in the sky.



 The analogy technolgy can also make the photo looks yellower, or darker. From this photo, the overall it looks yellow because of different films the phototaker has used.






2) What are some photographic techniques that can only be done using digital technology?
 If we want to replace the background of the pictures, we definitely need to use digital technology.

  



 From this poster, we can see that the background of yellow and orange is added by using the digital technology. We cannot change the color like this in the real world.

Only digital technology can mix different landscapes together into one photo, and managing the size as what the photo-maker wishes to.

 The analogy technolgy cannnot change imperfection like what photoshop does. Photoshop can remove ances from the girl's face, but the analog one can't.








3) What is the difference between analog photography and digital photography?
From Wikipedia, Analog photography means " photography using a progressively changing recording medium, which may be based either on a chemical process (e.g., photographic film or plate) or electronic means (e.g., using a vidicon or CCD sensor)."(1)While Digtial photography means"photography that uses an array of light sensitive sensors to capture the image focused by the lens, as opposed to an exposure on light sensitive film. The captured image is then stored as a digital file ready for digital processing (colour correction, sizing, cropping, etc.), viewing or printing."(2)Analog photography depend more on the physical means, like film or plate, but the digital photography depends more on digital functions. For axample, Digital camera can turn the photos into black and white by a click, but the analog phographs may need to change to a particular film, or arrange the lighting, darkness, so that it can take a black and white photo.
Reference:
(1)http://en.wikipedia.org/wiki/Analog_photography
(2)http://en.wikipedia.org/wiki/Digital_photography