 Diffusion
In Painter 7 watercolor, the diffusion effect is controled by multiple parameters.
I start with Soft Camel variant (Dab Type: Water Color Camel Hair), with Dry Rate lowered from 40% to 10%. This slows the drying process.
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The settings are as follows--Texture: Basic Paper, Opacity: 16%, Feature: 3.3, Resat: 100%, Bleed: 0%, Wetness: 139, Pickup: 15%, Dry Rate: 10%, Evap Thresh: 66%, Diffuse Amt: 68%, Cap Factor: 0, Grain Soak-In: 0%.
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In order to show how different settings influence the interaction of two strokes, I have used the stroke pattern to the right for the examples on this page. (I actually placed this image beneath the Water Color Layer and painted along the lines.)
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Lowering Evaporation Threshold from 66% to 10% makes the water to spread farther, carrying the color particles with it. This creates a fringe where strokes overlap.
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I raise Wetness from 139 to 722. The fringe is formed farther away from the original stroke.
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Pickup is raised from 15% to 95%. Color particles on the surface are picked up into water to be carried again. But they seem to turn into hard particles that are not water-soluble.
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I set Resat to 10% and Bleed to 90%, as it is usually done in Painter to make brush color mix with existing colors. And yes, I used the same colors as the above samples.
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About the strange behavior of Bleed parameter on Painter 7's new Water Color brushes, see Bleed and Pickup.
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