Digital BW, The Print

I think the point is that once a RAW is opened/decoded, it's not a file and it's a new image (raster?). The RAW remains unchanged.

gar

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On 1/5/08 at 10:47 AM Jim Goshorn wrote:

>On Jan 5, 2008, at 10:10 AM, Frank Jay wrote:
>
>> Can you explain the above please Shoshanna. I was under the  
>> impression that RAW files can't be printed as a RAW file, but must  
>> be translated to another type of file. I admit I have tons of holes  
>> in my digital and PS knowledge and I must have heard or read this  
>> and believed it.  Ques is.............. How does one enlarge  
>> directly from a RAW file?....OR, am I confusing, enlarging with  
>> printing.
>
>JPEG files can have what are referred to as artifacts. These may be  
>from for example, in camera sharpening or data compression. Also  
>remember that JPEG are 8 bit images which would be able to contain  
>256 (2^8) different tonalities. On the other hand, RAW can be  
>processed at 16 bit which would be 65,536 (2^16) tonalities. If you  
>have ever worked on an image in Photoshop and saw gaps in your  
>histogram appear, that happens because adjustments in the image have  
>been too extreme for the amount of data (tonalities) in the image. If  
>those gaps become significant enough you may start to see  
>posterization (unnatural tonalities) in the image. That situation  
>happens much easier in 8 bit images with 256 than 65,536 tonalities.
>
>In my workflow, I process the RAW image in Adobe Camera RAW, open it  
>directly into Photoshop, do my image manipulations, save the  
>Photoshop file as a master file and when I want to print it, I save a  
>flattened _copy_ of the master file for that purpose.
>
>As far as enlarging, that is controlled either by specifying an  
>output size in your RAW processing software of choice or in Photoshop  
>with the Image Size dialog. You have to specify the dimensions and  
>how many pixels per inch (PPI) you want the resulting image to be.
>
>Jim
>
>
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