When the pdf was RGB, the color was R=0, G=0, B=0. How do i convert all the text content like this? Also need the gray to be like: from rgb "100,100,100" to cmyk "C=0, M=0, Y=0, BLACK=60" (just guessing a value) GS generated a CMYK file, but i need the black to be pure black also How to convert TIFF to CMYK. Select file from file selector or drag file in drag box. File will be upladed and you can see loading icon. At end the file from TIFF to CMYK convertered. Now you can download file. This tool is for converting from TIFF to CMYK online without damaging the quality of resultant image.Our TIFF to CMYK converter tool is hKLXIUb.