The reason is that the Opacity and Flow options in the Brushes panel are directly linked to the ones we just looked at in the Options Bar. Opacity and Flow each come with a Control option and a Jitter slider.īefore you change any of the settings here in the Other Dynamics section, make sure you've set the Opacity and Flow options in the Options Bar back to 100% first, otherwise your results may not be what you expected. The second stroke appears as the same light gray color, but in areas where the two strokes overlap each other, the opacity levels combine to create darker, more opaque sections:
Here, I'll paint a second stroke, also at 25% opacity. The only way I can affect the opacity of my initial brush stroke is by releasing my mouse button (or lifting my pen off the tablet) to end the first stroke, then painting a second, different brush stroke that passes over top of the first one. Flow, on the other hand, controls the opacity level of each individual brush tip! Opacity controls the translucency of the entire brush stroke. That's the big difference between opacity and flow. Also, even though the brush tips themselves are overlapping each other, it made no difference to the opacity level. It remained at 25% throughout the entire length of the stroke, even in areas that were painted over twice. Notice that even in the areas where the brush stroke looped back over itself, the opacity value didn't change. With a brush opacity of 25%, it means we're seeing only 25% of the brush color mixed in with 75% of the white background. The reason is that by lowering the opacity value, the white background of the document is now showing through the brush color. The brush color now appears much lighter. Here's my brush stroke with the Opacity value set to its default 100%: I'll paint with black (by setting my Foreground color to black) and I'll increase the Spacing value to 50% in the Brush Tip Shape section of the Brushes panel so the individual brush tips will be easy to see, giving the stroke a "bumpy" look to it, with each "bump" being a new stamp of the brush tip. I'll paint a simple brush stroke using one of Photoshop's standard round brushes. A value between 0% and 100% will make the brush color semi-transparent, with higher values making the color more opaque than lower values. At 0% opacity, the brush color is transparent, allowing anything we paint over to show through (effectively making the brush color invisible). When the Opacity value is set to 100% (the default value), the brush color is opaque, completely blocking anything below the area we're painting over from view. Opacity controls the translucency of the brush color as we paint. With the Brush Tool selected, the Opacity and Flow options appear in the Options Bar.
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