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Which color model is best suited for tonal changes (i.e. curves) without changing the perceived color (hue, saturation; however defined)?

April 26, 2017best changes changing color Curves model perceived suited tonal

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Which color model is best suited for tonal changes (i.e. curves) without changing the perceived color (hue, saturation; however defined)?

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It would be best to use the CIELAB color space (LAB in Photoshop) to do these manipulations on the L*, or lightness, channel. This space is the most likely to give you perceptually meaningful results and changes in images without changing hue and chroma.