Photoshop: When creating new documents, change the color mode to CMYK in the New Document window. To convert an image from RGB to CMYK, open it and navigate to Image > Mode > CMYK. Before saving your PDF, install PrintingCenterUSA’s Color Profile and Adobe PDF Preset. Save your PDF using the recommended settings for accurate color.

Try converting C50, M40, Y40 K0 to RGB in this app and you will NOT get a neutral gray. You will get an RGB value of R128, G153, B153, which is a blue-green color. This app assumes a neutral CMY value of C50, M50, Y50, which is never the case. If you want to go from RGB to CMYK (and vice versa), you absolutely MUST know the source profile AND
Things are usually more difficult into the other direction here, meaning here converting from a higher/wider gamut to a small one, like for example from Adobe RGB to CMYK, since the wide gamut does have much more colors which you can't map 1:1 here. When I convert the CMYK Value (0;0;0;0) to RGB (= 254:254;254) and the RGB Value to Lab I get the following values: L = 0.0039978637360036373 a = 0.002777141984552145 b = 0.0030670634005218744 But the L-Value should be about 100%

We convert from RGB to CMYK to control the balance of ink for printing. If you are performing a batch operation, you exercise no distinct control and the mass conversion of individual images to CMYK may be pointless. A page layout program like InDesign can accept RGB images and then produce CMYK output in one simple operation.

After that, the Photoshop color settings must be changed. By going to the Color Settings dialog box and clicking on the RGB to CMYK option, you can change the color of the image. Select this option to open the RGB to CMYK color conversion dialog box. To convert an image from RGB to CMYK, you’ll need to make some changes to the color settings
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    • can you convert rgb to cmyk