Click Gaussian distribution, set value, select monochrome, click Filter-Blur-Dynamic Blur, set value, press ctrl+T, select rectangle, click Edit-Free Transform, cover all text with rectangle, right-click rectangle layer, select Create Clip Mask, press ctrl+L, adjust color scale, and press.
Chalk characters refer to characters written in chalk made of calcium carbonate (limestone), calcium sulfate (gypsum) and a small amount of calcium oxide.
Writing posture
The blackboard is upright and fixed on the wall. Chalk characters can only stand in front of the blackboard and write in the posture of "cantilever standing".
Pay attention to when writing: flat head, straight body, bent arms and steady feet.
Head leveling is to ensure the straightness of sight and make the written words neat. With the change of writing height, you can tilt slightly, but always keep your head straight and not askew.
Body means that the body is straight and not skewed. Translate with the left and right changes of writing position. Straight and not rigid, natural and easy to write.
Armbend means that the right arm holding the pen is bent at right angles, and it is most convenient to write when it is raised to eye level. As the writing posture changes up and down, the degree of arm bending will also change. Holding a book in your left hand, pressing the blackboard or drooping should be relaxed, natural and convenient.
Foot stability means standing with your feet apart to keep your body balanced and stable. With the change of writing height, you can stand on tiptoe or bend your knees and adapt to the situation (standing posture in writing brush posture).