Converting aRGB to sRGB with Relative Colorimetric Intent (RelCol)
Color space conversion from aRGB to sRGB with RelCol is the only method currently available with Photoshop. Refer to below illustration, data for destination1 was computed with straight Relcol to sRGB, whereas data for destination2 was computed with perceptual conversion to sRGB and with icc profile sRGB_jc1.
Above result show that for color space conversion from aRGB to sRGB with Relcol, the RED channel (G=B=0) begins to clip at R=219 (source space) onwards. These clipped colors are indistinguishable in sRGB color space.
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