I have .tiff. Part of the .tiff is a bar code. My printer is insisting the bar code be converted to 100%K - CMYK "pure black". (Their words)
A couple obstacles: 1) The Bar Code has been scaled up. Since it got resampled in that process, the edges aren't pure black anymore. Just selecting the black area by color is tricky now, since the outermost pixels might or might not be included.
2) The .tiff is in RGB8, and my printer wants CMYK. RGB rich black does not translate to 100% K in CMYK.
How would you go about changing this one part of the image to 100%K CMYK, to make the printer happy.