RGB & CMYK aren't just different colour models, they're also a different colour gamut, so there are RGB colours you cannot approximate in CMYK - there's no bright light shining from your colour - just bounce light, and colours absorb light, not add. It is different from the above tools as it converts rgb color to its cmyk equivalent. It does not convert the whole image but a single color. To use this tool just enter the rgb code of a color and click on the button. It can perform “CMYK to RGB” and “RGB to CMYK” conversion. If you want to quickly convert rgb color code to cmyk , this Step 2: Select From “RGB” To “CMYK”. You need to click on the “From” and select “RGB”. At the same time, set “CMYK” on the output box. Now, we need to upload images for the conversion. BGDQ.