interesting but I am not sure this makes the case as to whether or not ALL of the storybook photos are production photos or film stills .One thought I had about print media is that everything that is reproduced on the page to make multiple copies requires printers ink and after multiple copies are made , the saturation of the ink may become less , or in older books , there may be an issue or error with the printing plates . I am guessing they have quality control control for these things but would imagine with a high volume print run , some would slip through the cracks .The second youtube screenshot you posted looks a lot like the Gout ( 2006 Bonus dvd disc of the original film ) to me .Other than desaturated color, I see no difference between the two images , and why does the youtube clip say Luke leaving Dagobah ? Is he flying backwards ? I see the lights of four engines which are on the back of the ship . He is flying towards the planet , not away from it 😃 and after re reading your post , it does seem that you do see some value in images in pre digital print media as a valid guide to being used as color reference for editors