6 Replies Latest reply on Jul 20, 2017 3:11 AM by davescm

    Correcting for uneven lighting?

    gsstratton@aol.com

      I want to use a Haida style paining of a cinnamon bear as a greeting card but the picture of the painting was poorly illuminated so black at top has become gray at the bottom.  How can I make the colors consistent?  I am learning to use Photoshop 13 so do not let a seemingly over simplified answer inhibit you.  Gil S

      HaidaBear.jpg

        • 1. Re: Correcting for uneven lighting?
          davescm Adobe Community Professional

          There are some nasty colour changes as well as the shading. There is also some lens flare.

           

          One way is to make a mask from the 4 paint colours and use those masks on solid Color Fill layers

           

          To do this use the quick selection tool initially make a selection of the brown areas. (You can Alt click to remove from the quick selection and click to add.

          Add a solid color layer (set to brown) and then add a layer mask to that layer based on your selection (Layer - Add layer mask - Reveal selection). Now you can tidy up that mask by clicking on it and painting with white where you want the layer to show and black where you do not.

          Turn that layer off by clicking on the eye symbol in the layers panel

           

          Repeat for the other colors

           

          Turn the new color layers back on (eye symbols)

           

          Add another solid color layer with the paper color underneath the previous 4 colours.

           

           

          Dave

          • 2. Re: Correcting for uneven lighting?
            Trevor.Dennis Adobe Community Professional (Moderator)

            Nice job Dave.  I took a different approach.  As the OP mentioned the 'blacks at thew top', I am thinking that the darkest tones need to be black, or close to it.  So I pulled up the blacks with a curves layer.

            You can see from the colour sampler points that #2 is not quite there, so to even it up I ran a gradient down the curves layer mask.  Rather than stabbing in the dark trying to find the right start point for the gradiant, I set the foreground colour to 160,160,160 which is getting the three locations reasonably close.

            The background still has a problem, so I made an alpha mask from the red channel to make a layer mask for the graphic, placed a solid colour behind it.  The curves layer was affecting the background, so I clipped it to the graphic layer.

             

            My blacks are not perfect though, and Dave's approach gave you consistent tones across the graphic, so his way is probably better.

             

            A little side story about how you can get into a grove rut with your Photoshop workflows.  Late last night I finished a commissioned montage for the 'Centre for Applied Cross-cultural Research (CACR)' which involved a ton of inter layer masking.  I'd obviously had the workflow from that programmed into me, because my first approach to preventing the curves layer affecting the background was to do the same thing with a compound layer mask like this

            That was crazy because clipping is a single click operation. But it's a good excuse to let me show off my montage :-)

            • 3. Re: Correcting for uneven lighting?
              gsstratton@aol.com Level 1

              Wow!!!  Your montage would eat up about 10 years of my life.

              • 4. Re: Correcting for uneven lighting?
                davescm Adobe Community Professional

                Trevor.Dennis  wrote

                 

                Nice job Dave.....

                 

                 

                 

                Not that nice - I missed the mask on the bears left foot.

                 

                gsstratton - If you do follow the colour-fill method and want to change the tone of any colour just double click the colour-fill layer and the colour picker will open so you can alter it. Here I've darkened the brown :

                 

                 

                 

                Trevor - nice montage - did you do also do the video this year ?

                 

                 

                Dave

                • 5. Re: Correcting for uneven lighting?
                  Trevor.Dennis Adobe Community Professional (Moderator)

                  davescm  wrote

                   

                   

                  Trevor - nice montage - did you do also do the video this year ?

                   

                  Dave

                  Oh dear.  That has me cringing with embarrassment.  I shot >100Gb with three cameras at the last festival, and apart from the little video below, I have not got round to editing the rest of it.  I find trawling through a lot of video hard work.  

                   

                  This comes with a warning.  The young lady has worse pitch control than Lynda McCartney.  Actually, I just listened to Lynda again when finding that link, and on second thoughts, no one ever had worse pitch control than her. 

                   

                  Kathy and the Kiwis - YouTube

                  • 6. Re: Correcting for uneven lighting?
                    davescm Adobe Community Professional

                    Haha - I see what you mean.

                    Sounds like you need a deadline

                     

                    Dave