This image was generated by using the following prompt:
Prompt: single red rose.
Negative prompt: (worst quality, low quality, normal quality:1.8).
Let’s open the image in Krita.
Let’s use the [Similar color selection tool] to select the red region in the image.
[Shift + Select] as much red region as possible, without selecting other colors.
[Control + Shift + I] to invert the selection, and go to [Filter -> Adjust -> Desaturate].
Here is the result.
This is the end of the tutorial. 🙂