1. Open Photoshop and open new file
with white background.
2. Make sure to keep RGB mode or change the mode by
Image > Mode > RGB color
3. Create new layer. Select Rectangular Marquee Tool.
Draw rectangle. Fill it with red color. Deselect the selection with
CTRL + D

4. Create another layer. Draw another rectangle that
overlaps some portion of the red rectangle in the layer below. Fill
it with green color. Deselect the selection with CTRL + D .

Keep the mode on Dissolve. You will not find any change
in the image.
5. Change the opacity to 80% and check out the effect.

6. The green solid filled rectangle is changed into
the dotted rectangle.

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