Brush application applies more shear than roller application. A wall brushed at the corners and otherwise rolled can exhibit an effect called 'picture framing' - a light area surrounded by a darker, brushed area. Similarly, spraying generally applies more shear than brush or roller application so a paint applied by spray may appear darker than brushed or rolled touch up areas.
To avoid picture framing run your roller as close to the edge as possible.
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Colours shown on this website are a representation only. Please refer to the actual paint or product sample. Resene colour charts, testpots and samples are available for ordering online. See measurements/conversions for more details on how electronic colour values are achieved.