2 Replies Latest reply on May 5, 2017 10:16 PM by Stephen_A_Marsh

    file saving: Baseline vs progressive

    rachelm34466547 Level 1

      What are the differences, advantages, disadvantages  between Baseline and progressive options when saving a JPEG ?  a link to a tutorial would be nice

       

      Thanks

       

      R

        • 1. Re: file saving: Baseline vs progressive
          Trevor.Dennis Adobe Community Professional (Moderator)

          Hi Rachel

           

          Wikipedia has an excellent article on JPG compression

          JPEG - Wikipedia

          JPEG - Wikipedia  (lossless editing)

           

          But I think the sensible answer is that using the default setting will protect your sanity, and pixel peeping in general will surely lead to madness.  Of course context is important here.  We have a colour obsessed regular poster who works recording museum quality art, so it is obviously crucial that he takes every possible step to maintain accuracy and image quality, but I doubt he does so using JPG.  It has also clearly cost him his sanity, as he is as mad as a box of frogs.    

           

          If you are interested in the practical aspects of your question, find a high resolution busy image (the more complex the image, the harder JPG compression has to work.

          Save the image once using Baseline, and again using Progressive with quality maxed out to 12.

          Open the two saved copies, and name the layers so you know how they were saved.

          Drag each layer to the original, and align them. (Select the layers and go Edit > Auto Align layers and choose reposition.

          Now set the blend modes of the two higher layers to Difference

           

          If you duplicate the background (unsaved) layer and set it to Difference, you will see perfect black for each pixel.  That will not be the case with your two saved layers, but the difference will be very subtle.  I suspect you will not be able to say one was better than the other though.

           

          Personally, I feel content is more important that absolute quality.

          I hope this helps

          • 2. Re: file saving: Baseline vs progressive
            Stephen_A_Marsh Adobe Community Professional

            Many times a question has been asked before and answered, such as: jpeg saving opptions