Sketchup changes the color and shading of every object in a gradient across the body of the object to give the illusion of 3D on our 2d screens. It makes sense to me that if you picked a color from the color picker and applied it to a cube, then applied an out of app color checker to examine the screen you would get the proper rgb from the swatch in the color picker as it’s not being shaded by the sketch up render engine, but if you sample the screen over the cube the values would be all over the place as sketchup rendering is changing the color on purpose. This is what use sun for shading and its settings is all about.
The desktop background is a solid color so that works, but the sketchup cube is not.
as well as Fredo’s plugin or doing the same manually, you really need to confirm gamma and colour profiles for devices and programs match…
on a mac…
use System preferences to ensure your display is suitably calibrated for non-native apps and printers…
use colorSyncUtility.app to check all installed profiles have no errors…
use Digital Color Meter.app using the target profile and arrow keys to get precise rub or l*a*b values…
if you have multiple display an external device needs to be used to set the gamma as close as possible…
disable screen dimming and tinting if requiring reasonably accurate colour representation…
OT: when working on ‘high end’ product models in the 90’s it was not uncommon to see pantone colour swatches [supplied by the client] over-sprayed to ‘match’ a finished product model end colour…
I’m used to Photoshop on a Mac, not Affinity (yet…we’ll see) or Windows, and the color picker in Photoshop will pick up the screen color from other applications in the background, but as I understand it, the three numbers entered in a non-color managed application do NOT correspond to the same color with the same numbers in a color managed application like Photoshop. The 8-bit numbers used for color are better understood if you convert them to percentage (128 = 50%), and then ask yourself “percent of what?” The values only have meaning relative to some defined color space. Photoshop and other Adobe apps allow you to choose what color space to work in in preferences. These days, I use ProPhoto RGB for photography work. I’m still unsure what exactly is assumed for a color space in SketchUp (or any other non-color managed app in your system), which is a question to answer for the “missing profile dialog box” in Photoshop when opening a file. One way to look at it is: 100% red in ProPhoto RGB (a very large gamut space) corresponds to a shade of red that is beyond 256 in a smaller gamut space like sRGB. Not unlike “This is Spinal Tap” and the amp that goes up to eleven.
