The Spline Color Correction texture is one of the three available color correction textures along with Color Correction and Bezier Curve Correction. The Spline Curve texture allows remapping any other texture color values using RGB or HSV curve controls.
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To color-correct a specific texture using a Color Correction, right-click on the texture slot to bring up its context menu, select Wrap In and choose Color Correction. This places the existing texture within a Color a Color Correction and then plugs it in the original slot.
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Any texture can be replaced via the Replace With New Texture () button, which activates when you select the texture to be replaced. If the texture is an instance, all copies are changed as well.