whats the preferred file for RAW

T
Posted By
TinyJohnsonn
Nov 29, 2004
Views
324
Replies
3
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Closed
should i save my pictures as Tiff or PSD or is there a better choice.

Just bought a Nikon D70 and took a few shots using Raw

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LL
Leonard Lehew
Nov 29, 2004
On Sun, 28 Nov 2004 23:22:19 -0800, (Tiny
Johnson) wrote:

should i save my pictures as Tiff or PSD or is there a better choice.
Just bought a Nikon D70 and took a few shots using Raw
First, of course, keep your original raw files. Those are basically your digital negatives, so you can always go back to them if you need. Both TIFF and PSD formats are "lossless" in the sense that they retain all the image information that results from converting the raw format. If you are concerned that time will pass, and you will lose the ability to read the original raw files, you may want to also convert the raw file to TIFF or PSD and save a copy before you make any adjustments. For this purpose, TIFF may be a better option as it is a standard format.

I always use PSD files for my "working" images. I can’t think of any advantages of using TIFF except perhaps easier interchange with other programs. I wouldn’t be surprised if the PSD format can store things not stored in TIFF files. Something sticks in my mind about TIFF not storing alpha channels. I’m sure someone here can confirm or deny this.

Cheers,

Leonard
B
birdman
Nov 29, 2004
My concept of the issue:
There is no purpose to save an unprocessed raw image as a tif (or other format) file because there will be no way to convert back to raw format for processing.
It is not clear if the Adobe digital negative format will catch on, or even if Adobe will continue to support their new format. If Adobe continues to support the format then converting your raw image to that format may provide long term storage and usability of the raw data.
If you use lossless methods of image manipulation in Photoshop saving the image in psd format is preferrable so all your work is preserved, resumable, can be undone and saved in as compact a form as possible. If you want to send your image to someone who may not have a program that can open psd files then flatten the image and save it as a (non-compressed) tif or even a high quality jpeg.
J
JPS
Nov 30, 2004
In message <lIHqd.26385$>,
"bmoag" wrote:

My concept of the issue:
There is no purpose to save an unprocessed raw image as a tif (or other format) file because there will be no way to convert back to raw format for processing.
It is not clear if the Adobe digital negative format will catch on, or even if Adobe will continue to support their new format. If Adobe continues to support the format then converting your raw image to that format may provide long term storage and usability of the raw data.
If you use lossless methods of image manipulation in Photoshop saving the image in psd format is preferrable so all your work is preserved, resumable, can be undone and saved in as compact a form as possible. If you want to send your image to someone who may not have a program that can open psd files then flatten the image and save it as a (non-compressed) tif or even a high quality jpeg.

I’m already finding good uses for the digital negative converter. It is by far the easiest way to rip the real RAW data. The uncompressed DNG files have the pure RAW bitmap after the header. I could easily see intermediate processing being done, like a program that takes the RAW data before it is demosaiced and removing noise. Noise is, after all, something that happens underneath the color filter array. A program could add multiple exposures in the RAW state.


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