Community Expert , Oct 31, 2018. As Test Screen Name , says, find out if you need CMYK. Yes, they have a smaller gamut. When you look in the Color Picker, you will see a triangle when you pick an out-of-gamut color. Click the triangle to watch the color jump to the nearest printable color. (Don't worry about the obsolete web control.) To do this, open your photo in Photoshop, go to Image > Mode, and select the color mode you want to convert your photo to. If you are converting from RGB to CMYK, a dialog box will appear asking In the Channels panel, select the composite color channel. Apply a Channel Mixer adjustment. In the Properties panel, do one of the following: Select Monochrome. Select one of the default presets from the Channel Mixer menu: Black & White Infrared (RGB) Red=‑70%, Green=200%, Blue=‑30%. There are a few different ways that you can change the color mode in Photoshop. One way is to go into the Image menu and select Mode. From there, you can choose the color mode that you want to use. Another way is to use the keyboard shortcut Ctrl+Shift+U (Windows) or Cmd+Shift+U (Mac). This will bring up the Change Color Mode dialog box, where ProPhoto RGB Color Space. A behemoth compared to sRGB, ProPhoto RGB comes with its own set of idiosyncrasies. Though it’s a favorite of many high-level professionals, its wider color gamut includes colors that monitors can’t yet process and even some that the human eye can’t see. With Photoshop, simply open the image file, click on the “Image” menu, and then select “Mode.”. A drop-down menu will appear with various color mode options. Choose “RGB Color” from this menu and then click “OK.”. The image will now be in RGB color mode. Color data is stored in the RGB color space, which is used to optimize and Pure CMYK black (K=100) appears jet black (or rich black) when viewed on‑screen, printed to a non-PostScript desktop printer, or exported to an RGB file format. If you prefer to see the difference between pure black and rich black as it will appear when printed on a commercial press, you can change the Appearance Of Black preferences. Especially considering RGB - CMYK and you color settings. Color settings I recommend North America Prepress 2. PDF export: PDF/X-4:2008. In the output select "Convert to Destination (Preserve numbers) and set the destination to "Document CMYK" You will have to change the blend space back to CMYK for print output. wZ5kx6.