不好意思  小弟我是個電腦白痴 只是對攝影還有點興趣  剛好最近買了掃描器掃正片  又聽說RAW檔在PS裡後製效果較好
言歸正傳  那就是說掃描器根本無法掃成RAW檔囉? 只能從數位相機嗎?
謝謝指教

加減參考一下～               ^_^

http://en.wikipedia.org/wiki/Camera_raw

http://www.photo.net/learn/raw/

Using Raw Scan Files

If you're scanning many images in one session, the most efficient way to do this is to scan each image once and save the raw CCD data in a file. Once the raw CCD data is stored in a file, you can re-process the scans in a variety of ways without needing to re-insert the image into the scanner. This minimizes the opportunities for the film to get dusty, minimizes film handling, and is the fastest way to re-process all the scans if you decide you want to use different options for the scans.

To do batch scanning, you first need to set up the options in the "Input" tab for the source and media you're using. First, set "Input|Options" to "Advanced" and use "File|Default options" to set up default options. Then set "Crop|Preview area" to "Default", set "Crop|Crop size" to "Maximum", set "Crop|Y images" to 1, and in the "Output" tab un-check all the options except for "Output|Raw file" (which should be on).

When you scan each image, files named scan0001.tif, scan0002.tif, etc. will be created. You can also change the folder and file names by changing the "Output|Raw file name" option. To re-process these raw files, set the "Input|Source" option to "File", set "Input|Files" to point to the starting file in the series (normally scan0001.tif), set "Input|Mode" to the type of scanner that the files came from, use the "File|Default options" command to set all the other options to their default values, then set up the other options as if you were scanning from the scanner instead of a file.

Set "Input|Batch scan" to "All" to scan all files, or set it to "List" and manually set the frame numbers. For instance, if you set this to "1-3,5,7", then scan0001.tif, scan0002.tif, scan0003.tif, scan0005.tif and scan0007.tif will be processed when you press the "Scan" button.

You may also want to follow the procedure in the "Advanced Workflow Suggestions" section of this User's Guide for locking the exposure and film base color for the whole roll of film. This will result in scans that will have the best quality.

樓主你可能是看到一些dc存RAW檔效果比較好的文章.

RAW只是掃描或Dc照到的資料的一個原始檔. 可是它單色的階調數通常超過8個bit, 因此現有大部份的圖檔沒辦法存(因為是8bit的檔案格式), vuescan的作法是, 用現有的16bit, Tiff檔存原始資料 (不過你的tiff檔, 第一它應該是8bit的, 第二, 它已經被掃描軟體處理過, 所以是不一樣的資料).  不過這種作法不很經濟, 因為掃描的資料可能只有12bit, 你用16bit的檔去存, 是白白浪費空間(而且這些資料還有作非破壞性壓縮的空間). 各個DC廠商因此會定義自己的RAW檔. 所以你會發現, 同樣一千萬畫素的圖, DC的raw檔的檔案大小, 一定比vuescan的raw檔來的小. 因此掃描過程是一定會產生RAW檔的資料, 只是原廠的掃描軟體通常是不會給你儲存的選項.
  你的想法不可行是你不可能把已經處理過的資料再回復原狀. 掃描器掃出的原始資料可能有4096階(如果是12bit),這部份主要是硬體, 和掃描軟體關係不大, 掃描軟體處理後通常就是存成256階(8bit), 不論是8bit的tiff檔, bmp, jpeg. 你無法把一個已經從4096階殺成256階的資料再把它轉回去.  

RAW 檔要作輸出  還是要轉換JPG  畫質一樣要下降  那還不如用TIF檔  雖然檔案大些........對嗎