You open the image; You go to Image > Mode > CMYK; And you get a CMYK converted image; The DPI will not change at this stage, however, what you do next is likely changing the DPI. For instance, avoid using Save for Web, if you're doing that, this is likely the problem. Try to use Save As and pick JPG, TIFF or PSD as the final format. For this issue, Image Editors like Photoshop use CMYK **MODE**.In this mode , if you select the RGB color, the editor convert it to color that you see after printing and shows that to screen.this conversion is absolutely depend on color Profiles ( here ICC ) Now convert your image to RGB, as in Figure 5-29. When you convert your image from its current RGB state to CMYK (Image » Mode » CMYK Color), Photoshop will read the settings you have put in and convert the image without a black channel back into CMYK, and you'll end up with a three color image ( Figure 5-30 ). To start this process, head up to the “Image” tab again. Scroll to the “Adjustments” tab and click “Selective Color.”. This will bring up a pop-up window that allows you to adjust primary colors that affect the CMYK image. You can adjust red, yellow, green, cyan, blue, magenta, white, neutral, and black. This will remove the CMYK from your image. Another way to remove CMYK from your image is to go into the “Channel” menu and deselect the CMYK channel. This will make the CMYK channel invisible and your image will no longer be in CMYK mode. You can also use the “Select” menu to choose the “None” option. This will remove all of the Community Beginner , Sep 06, 2023. Unfortunately on a mac ayt leadst there is NO default RGB to CMYK conversion action. Its just not part of PS. I can't undertsnad why people sare saying, "yeah for batch RGB to CMYK coversion, go in PS and in the File>Automate>Batch. Export/save for web, is for optimizing jpeg/png/gif files for web/screen use (minimal file size, remove anything not strictly needed to display the image). It will be converted to RGB, 8-bit, and it discards most metadata like PPI. The checkbox you said was for "convert to RGB" is, if you read again, "Convert to sRGB " (a specific profile). Choose the ‘Convert RGB to CMYK’ action from the drop-down menu. Choose the source folder where your images are stored, then choose a destination folder where Photoshop will save the converted images. 1. Adobe RGB. Adobe RGB was created by Adobe Systems Inc. in 1998 to improve the gamut range of sRGB. Adobe RGB is a larger colour space which results in more vibrant images. Another benefit is that you can convert images to sRGB for monitors (and online use) Adobe RGB is a space that’s sometimes too big to be displayed on an average screen. Hey, I no longer use CSP, but I used to press the letter y as the shortcut for switching between colour profiles. You have to choose a profile first by going to View > Colour Profile > Preview Setting, and pick a CMYK profile. Then I'd press y to see what the colours looked like, in case I wanted to print in CMYK and my blues and greens looked bad. EyNL.