When MAX(R, g, B)=MID(R, g, B)MIN(R, g, b), only the composite color has no monochrome;
When MID(R, g, B)=MIN(R, g, B)MAX(R, g, b), there is only monochrome without multicolor;
When max (r, g, b) = mid (r, g, b) = min (r, g, b), it is colorless neutral gray.
Drag directly in the image for black-and-white conversion.
This command has a feature that you can not only drag the slider in the dialog box for conversion, but also directly drag the corresponding area in the image for conversion.
As mentioned above, generally speaking, the color of any point in an image includes monochrome and multicolor. So, when dragging directly in the image, do you change monochrome or multicolor? Through experiments, make judgments according to the following rules:
When mid (r, g, b) >; When min (r, g, b)+[max (r, g, b), -min (r, g, b)]/2, the multicolor is directly dragged to change in the image, and vice versa.
Check the Dyeing option.
Do the following experiments first:
After checking the dyeing options, adjust the hue and saturation sliders in the dialog box. Then click the color block on the right to pop up the color picker, write down the H, S and B values of the color block, and write down the R, G and B values of the sampling points in the information palette.
Use mixed mode to simulate dyeing options.
Uncheck the "Dye" option, then create a new layer on it, fill in the H, S and B values you just recorded, and change the blending mode of this layer to "Color". The RGB values of the sampling points in the observation information palette are exactly the same as those after checking the "Dye" option in the previous step. think
The principle of the black-and-white conversion command has now been made public.
However, there is a problem worthy of our consideration: in the case of dyeing, the dyed color is obviously related to lightness. Why does the Dye option only have sliders for hue and saturation, but no sliders for lightness?
My understanding is that everyone's habitual thinking should be that the adjusted black-and-white image constitutes the brightness of the image, and together with the "hue" and "saturation" in the dyeing frame constitutes the final color. If you add a lightness slider to the dyeing frame, there will be two lightness, which is easy to be confused. Therefore, PS adopts the method of hiding the sky and crossing the sea here, omitting the "light" slider that should have existed.
In addition, friends who know the color mixing mode should also know that the "lightness" in the dye box is not the same as the "brightness" in the color mixing mode, so naturally it is not contradictory.