## Linearizing with Photoshop .cube LUT files The .cuve LUT file has 256-correction curve points and will be more precise in the extreme highlight and shadow tones. Using the .cube LUT correction requires converting your image grayscale to RBG and ### Photoshop .cube LUT File Instructions Make sure your defualt RGB color space is Adobe RGB, and the Grayscale workspace is Gray Gamma 2.2 in your Photoshop Color Settings. * Open your final image you want to print in Photoshop. * Convert to 16-bit RGB (it will automatically be converted to Adobe RBG1998 if your RGB color space is set to that. If not, go to the Photoshop Edit menu -> Convert to Profile -> Adobe RGB 1998) * Invert the image if it has not already been converted to a negative * Create a new color LUT adjustment layer. ![[../Screenshots/QTP-ProDN/create new LUT adjustment layer.png]] * Select the Color LUT layer from the Layers panel and click the **Load 3D LUT** oprion in the Properties Panel * Select the .cube file you saved from the profiling application ![[../Screenshots/QTP-ProDN/load LUT preset .cube file.png]] ![[../Screenshots/QTP-ProDN/corrected image with LUT adjustment layer.png]] * Flip the image horizontally if needed and save it with any relevant file name to signify it has the curve applied to the image directly. * Make the corrected negative on your transparency material and print it with your standardarized exposure and processing steps. #### Non-QTR Workflows If you are using the color driver with a color fill layer to achieve your blocking density you should take the following steps. Follow all the steps above and then apply the color fill layer you used when printing the linearization target **above** the LUT layer in the layer stack. [[[4. Linearization]]