Demo

Direction

1. File > New > any size (mine used 100x100 pixels) with black background (or other color you like).

2. Press D.

3. Press Q (enter Quick Mask Mode).

4. Creat a new layer > select Graident Tool (). Draw a line from the left to the right of your document.

5. Go to Filter > Pixelate > Color Halftone, use default settings.

6. Press Q (exit Quick Mask Mode).

7. Select foreground color (I used #F37AE6). Go to Edit > Fill > fill in the selection with Foreground color.

8. Ctrl + D.

9. Done.