7 Replies Latest reply on Dec 3, 2015 7:49 AM by thedigitaldog

    Color Management myths?

    lah8 Level 1

      Hi.  I was very interested to know if there are common color management myths out there, and what they might be?  Thank you.

        • 1. Re: Color Management myths?
          jdanek Level 4

          That's a pretty good set up question.  I can think of a few.  However, this post will become rather long and consist of so many myths, you could write a book.  One myth I can think of right off the top is people believe color management started with the computer. 

          • 2. Re: Color Management myths?
            D Fosse Adobe Community Professional & MVP

            The most persistent one, IME, is that it's so complicated and difficult. This is mainly caused by applications that don't have it.

             

            IOW color management gets blamed for lack of color management. A very frequently encountered example is the "mysterious web browser color shift". There's nothing mysterious about it.

             

            And then of course there's this: http://www.colorwiki.com/wiki/List_of_Color_Management_Myths

            • 3. Re: Color Management myths?
              G.Hoffmann Level 3

              Dag, thanks for the link, which I didn't know.

               

              Very interesting, though the issues are mostly just misunderstandings – and the author

              seems to be somewhat polemical.

               

              I would like to add this myth:

              RGB-space ProPhoto is of much use for processing real world images.

               

              In my opinion, ProPhoto-RGB is of no use for processing images of reflective surfaces.

               

              Years ago, Giorgianni and Madden felt happy, crashing one myth after the other:

              Digital Color Management: Encoding Solutions: Edward J. Giorgianni, Thomas E. Madden, Michael A. Kriss: 9780470512449: A…

               

              Best regards --Gernot Hoffmann

              • 4. Re: Color Management myths?
                D Fosse Adobe Community Professional & MVP

                G.Hoffmann wrote:

                 

                I would like to add this myth:

                RGB-space ProPhoto is of much use for processing real world images.

                 

                That's a good one . I like it.

                 

                Everywhere, you're told that bigger is better, and ProPhoto is the only color space worth the name. But what are you going to do with all those neon colors? You certainly don't see them in the real world.

                 

                I use ProPhoto very rarely, and only as an intermediate step until I can remap into something more manageable.

                • 5. Re: Color Management myths?
                  thedigitaldog MVP & Adobe Community Professional

                  lah8 wrote:

                   

                  Hi.  I was very interested to know if there are common color management myths out there, and what they might be?  Thank you.

                  Just use sRGB. Or Most/many labs output to sRGB. There is no such thing as an sRGB printer.

                  Soft proofing doesn't work. It doesn't work for some because they don't have all their color management ducks in a row or calibrate using the next myth.

                  Always calibrate your display for (fill in the blank, a value for cd/m2, a CCT Kelvin or Standard illuminant value, a gamma setting). Absolute nonsense, your mileage and numbers will vary.

                  Always use a Relative Colorimetric rendering intent (or always use.... Fill in the blank). Profiles know nothing about color in context.

                  Photoshop converts all data into Lab to produce numeric readouts. Uses yes, converts no.

                  No real world images can benefit from ProPhoto RGB (got a video to prove otherwise). If you're processing raw data in an Adobe raw processor, you're utilizing ProPhoto RGB gamut.

                  Gamut is the number of colors. ProPhoto RGB has more colors than sRGB. Not even close.

                  All profiles are created equally. Wrong, easy to illustrate that's simply not the case.

                  24 bit images contain 16.7 million colors. No, they contain 16.7 million device values. Don’t confuse a color number, a device value, as a color you can see!

                  RGB is a larger gamut than CMYK. Overall, perhaps (define the specific RGB and CMYK color space). Fact is, SWOP v2 has colors that sRGB can't contain as the gamut is too small.

                  If you take a print from one location to the other and the color changes, that's Metamerism. Nope, Metamerism is good, metameric failure of two solid patches isn't good.

                  • 6. Re: Color Management myths?
                    thedigitaldog MVP & Adobe Community Professional

                    G.Hoffmann wrote:

                    In my opinion, ProPhoto-RGB is of no use for processing images of reflective surfaces.

                    Well it makes a hell of a difference on the output of my prints!

                     

                    The benefits of wide gamut working spaces on printed output:

                    This three part, 32 minute video covers why a wide gamut RGB working space like ProPhoto RGB can produce superior quality output to print.

                     

                    Part 1 discusses how the supplied Gamut Test File was created and shows two prints output to an Epson 3880 using ProPhoto RGB and sRGB, how the deficiencies of sRGB gamut affects final output quality. Part 1 discusses what to look for on your own prints in terms of better color output. It also covers Photoshop’s Assign Profile command and how wide gamut spaces mishandled produce dull or over saturated colors due to user error.

                     

                    Part 2 goes into detail about how to print two versions of the properly converted Gamut Test File  file in Photoshop using Photoshop’s Print command to correctly setup the test files for output. It covers the Convert to Profile command for preparing test files for output to a lab.

                     

                    Part 3 goes into color theory and illustrates why a wide gamut space produces not only move vibrant and saturated color but detail and color separation compared to a small gamut working space like sRGB.

                     

                    High Resolution Video: http://digitaldog.net/files/WideGamutPrintVideo.mov

                    Low Resolution (YouTube): https://www.youtube.com/watch?v=vLlr7wpAZKs&feature=youtu.be

                    • 7. Re: Color Management myths?
                      thedigitaldog MVP & Adobe Community Professional

                      Here's an article uploaded yesterday filled with myths:

                      How to check your photo’s colors before ordering print projects online | Macworld

                       

                      As you can see, it’s important to preview your images in the color space in which online printers actually use (sRGB). Nope.