In the process of making corrections for the DN in some situations 2 or more Curves Adjustments have to be used. In such situations the possibility to merge the Curves into a single equivalent one would be quite handy. I have tried the ".RAW file -> .AMP file" path for the merging process but the results were not always correct, especially when working in the PS RGB mode with curves with different shapes for the R,G and B channels. That's why I made a script to merge 2 or more Curves Adjustment Layers into a single Curves Adjustment layer. In fact the script will merge more types of Adjustment Layers into a single Curves Adjustment layer equivalent with all the merged Adjustment Layers. It works in the PS-RGB mode with any kind of Curves Adjustments. You can download it here free of charge. INSTALL : unzip the file and copy the resulted folder into the Photoshop/Presets/Scripts folder. It contains 2 files, the script file and a small bitmap file needed for the script to run. Next time you'll open PS the "MergeAdjustmentLayers" script will appear under the "Scripts" menu. HOW TO USE IT : Open a new Document in PS, set the Image-Mode to RGB 8 or 16 Bits/Channel, load the Curves you want to merge into new Adjustment Curves Layers and run the script. Take care - the order of the Curves Adjustment Layers to be merged is important! Arranged in a different order the same Curves Adjustment Layers will produce different results. Open an existing Document that contains more Adjustment Layers (they don't need to be only Curves Adjustments) and any other Layers in PS. Keep "visible" only the Adjustment Layers you want to merge and make "invisible" all the other Layers. Run the script. THE RESULT : the script will add to your Document a Curves Adjustment Layer named "Merged Adjustments" with a red icon and marked "invisible". It contains a pen-Curve equivalent to merging all the visible Adjustment Layers of the types mentioned below from your Document. ADJUSTMENT LAYER TYPES THAT CAN BE MERGED : BRIGHTNESS / CONTRAST LEVELS CURVES EXPOSURE VIBRANCE HUE / SATURATION COLOR BALANCE PHOTO FILTER INVERT POSTERIZE THRESHOLD SELECTIVE COLOR All Layers of other types than the ones mentioned above as well as all Layer Masks and all "invisible"-marked Layers will be ignored in computing the resulting Curve. NOTE : the pen-Curve Adjustment is not really a curve. In fact it is a mapping graph allowing to map each of the 256 levels of gray into new values, one by one, without roundings or distortions induced by the strange curvatures that sometimes can appear in a Curves Adjustment drawn by other methods.