10 Replies Latest reply: Jan 17, 2011 11:35 AM by clvrmnky RSS

    How Big Is 5MB

    Duck Shots Community Member

      Submitting images with an application for Grad School. Exporting from LR3. What size should I make the images? Is full size JPG less than 5MB. I feel like an idiot.

       

      The Duck

        • 1. Re: How Big Is 5MB
          Pete Marshall Community Member

          If they are asking for a 5GB file then that is the size of the open file, not the compressed file I would assume. Compression massively reduces file size, but the open file remains the same size. A jpg with compression that remain at 5 GB would have to be an absolutely massive file to start with, however a open file that was 5 MB as a jpg would be not that large. For a 16 bit file 5 MB is pretty small. All could be from exactly the same image with exactly the same real world size.

           

          If the file is 8 bit RGB then it is calculated so (w in pixels x height in pixels x 24)/8 = size in bytes,     1 Kilobyte (KB) = 1,024 bytes    1 Megabyte (MB) = 1,024 KB 1 Gigabyte (GB) = 1,024 MB

           

          Asking for a 5GB file from a photograph is a silly request. They should specify minimum/ maximum pixel dimensions as well as format and bit depth otherwsie it is a pretty meaningless request.

          • 2. Re: How Big Is 5MB
            Ian Lyons ACP/MVPs

            ambienttroutmask wrote:

             

             

             

            Asking for a 5GB file from a photograph is a silly request. They should specify minimum/ maximum pixel dimensions as well as format and bit depth otherwsie it is a pretty meaningless request.

             

            He was asking for 5MB not 5GB

            • 3. Re: How Big Is 5MB
              Pete Marshall Community Member

              GB or MB, still a silly way of specifying a image file.......,

               

              If, in fact, it is just an upload thing, no file or files greater than 5 MB, then that is just a simple matter of applying a little compression on export. If it is a request for a particular file size then it is silly no matter what. I get request like this all to often from clients, and immediately know they don't really understand file sizes. Even better are those who say, must be 300 dpi, without any other reference. I always feel like sending them a 100px X 100 px image with 300 ppi in the metadata and seeing what they make with it.

              • 4. Re: How Big Is 5MB
                Lee Jay-ZyZk56 Community Member

                ambienttroutmask wrote:

                 

                GB or MB, still a silly way of specifying a image file.......,

                 

                It's better than dpi.  I once sent a 2MB, 6MP JPEG to someone at 72dpi.  I got it back saying they needed 300dpi.  I was sorely tempted to send them back a 1 pixel image at 300dpi.  I didn't, but I did send them back the very same 2MB, 6MP JPEG with the dpi tag changed.

                • 5. Re: How Big Is 5MB
                  areohbee Community Member

                  To limit jpeg file size to 5MB, check the 'limit file size' box in the export dialog box and enter 5000(K).

                   

                  I dont know if that's really what you want, but I didn't see this mentioned upon my scanning of the thread.

                   

                  R

                  • 6. Re: How Big Is 5MB
                    clvrmnky Community Member

                    And make sure you use the latest Lightroom 3 minor release, as this addresses issues in the filesize limit export option.

                    • 7. Re: How Big Is 5MB
                      Duck Shots Community Member

                      I have. I set it at 5000k. Is that correct?

                       

                      duckshots@comcast.net

                      • 8. Re: How Big Is 5MB
                        Duck Shots Community Member
                        • 9. Re: How Big Is 5MB
                          Duck Shots Community Member
                          • 10. Re: How Big Is 5MB
                            clvrmnky Community Member

                            Duck Shots wrote:

                             

                            I have. I set it at 5000k. Is that correct?

                             

                            duckshots@comcast.net

                             

                            Sounds right. Remember that Lightroom will try to get as close as possible to the value you set this to. It may not be on the money, and may actually create JPEGs slightly larger. It depends on the other options, and the contents of the original image file it is processing.