Fresco assigns all colors similar values when viewed in greyscale .... does this make sense?

Question

Colors have tone values, which can be judged by viewing color art in greyscale .... . I noticed that Fresco does not reproduce this expected behaviour, when I put down colors with different hues (but same saturation/brightness) and view them in greyscale (using a color adjustment mask or setting the iPad display to greyscale) - the show essentially the same tone value. This confuses me and spoils the use of tonal studies in learning coloring & art with Fresco. Any ideas/chance to correct this?

hakru · Answer

Edit:I was wrong about the iPad display to greyscale setting - this produces the expected  greytone value variation among the color spots in Fresco. However, my attempts to use a mask to obtain the greytone values of the color spots directly in fresco with the iPad display in color mode fail:To obtain greyscale in Fresco, I add a filter mask ("Hue/Saturation") and set "saturation" to -100, leaving Hue & Brightness untouched (0). Applying this mask to an imported color foto yields the expected greyscale image., applying it to the layer with the color spots shows them all in a very similar, unified greytone. That's very different from what I see for the spots with the greyscale setting for the display.

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