2 Replies Latest reply on Mar 2, 2012 4:57 PM by Jeff Schewe

    Issues with file size and Camera RAW

    richenlow

      I am using Photoshop CS5 with all current updates installed on a Mac running Lion.

       

       

      I am having a problem with the handling of the camera raw format (specifically .arw) and how Photoshop handles the format.

       

      My first issue is that upon loading the format into Photoshop, the program is cropping a bit of the image from both the left and the right. I have not found a way to stop this from happening.

       

       

      Another issue is file size.

      A client is having issue with the file size presented.

      They are providing me an ARW file that is 14.8 MB and I am making edits and provided them with a large jpg from photoshop (jpg qaulity turned all the way up) and they are getting a jpg at 9.7 MB. They are concerned that I am giving them a less than quality result.

      I know that any conversion from a camera raw format to a high resolution jpg will result in a lower file size and that has been explained however the client has taken the raw format parsed it through Mac Preview, saved it, and resulted in a larger file size than I could provide in Photoshop.

       

       

      This then becomes a confusing situation to handle.

       

      Questions:

      a) How to explain the lower file size happening in Photoshop to the client (what is lost?)

      b) Why they can use mac preview and get a larger file size that I can at full resolution jpg in Photoshop?

      c) Is there a way I can make this client happy without moving to a tif file format?

      d. Why is Photoshop cropping the .arw file?

        

      It seems that I cannot adequately explain what is happening to the client and would appreciate any help or solutions.

       

       

      Thanks much,

        • 1. Re: Issues with file size and Camera RAW
          Noel Carboni Level 7

          There's not just one "Camera Raw Format".

           

          What brand and model camera is the .arw file from?

           

          -Noel

          • 2. Re: Issues with file size and Camera RAW
            Jeff Schewe Level 5

            richenlow wrote:

             

            Questions:

            a) How to explain the lower file size happening in Photoshop to the client (what is lost?)

            b) Why they can use mac preview and get a larger file size that I can at full resolution jpg in Photoshop?

            c) Is there a way I can make this client happy without moving to a tif file format?

            d. Why is Photoshop cropping the .arw file?

             

            a) If you are comparing an uncompressed raw file with a compressed JPEG file, it's apples & oranges. When you save a file as a JPEG, the color image data is strongly compressed while preserving the luminosity. That's what results in the smaller file size. Whether or not the color compression will impact the file down the road can't really be known. What is known is open, editing and resaving JPEGs is not encouraged. If you are supplying final full retouched JPEGs that will never undergo addition imaging, that's one thing (and ok) but if somebody down the road edits the image, and resaves as a JPEG, that's not a good thing. You might want to consider supplying TIFF files instead of JPEGs.

             

            b) Different apps have differend JPEG encoding...again, this is apples and oranges...

             

            c) can't tell you what your client will and won't be happy with....sorry.

             

            d) Camera Raw/Lightroom will process raw files into RGB files. Some cameras will have automatic lens corrections applied. Without knowing the exact camera involved, nobody can really say. The question would be how are you comparing the images? What software is not showing the cropped edges?