Hi

a. Please what is the difference between RGB Mapping and luminance mapping.

b. Please can you explain the functions of MB 1D Frame Mod and MB Attribute Index parameters.

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i'm using Graffiti preset

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Are you talking about one of the graffiti grid scan presets from V4? They don't use the Source Alpha brush type. 

Yes please

Please I am using source brush under the brush type control panel.

If you want to use the image brush's alpha channel for the brush shape (and associated anti-aliasing), you need to use the Source Alpha brush type. Otherwise, 255 white in the brush rgb channels masks the brush out, and 254 to 0 blends if your Fill Option is set to Blend. If it's set to From, then there is no anti-aliasing.

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