CMYK and K only printing

[Simon Robinson]

I do not run an HP Indigo press but I use a printing firm that does. I publish photozines and books and I am trying to understand something. Many of the books I have printed are full colour, some are a mixture of colour and black and white images and some contain only black and white images. The black and white images are greyscale.

I am trying to understand why, sometimes, the black and white images are not printed with black ink only - I have had the same file printed beautifully with lovely neutral black and white images and then when I get it reprinted the black and white images are dark, muddy and have a blue or green tint.

It really is driving me mad!

 

[mantman]

There is an option of removing any icc profile when RIPing the file, also make sure you give images in CMYK form and not RGB

 

[Impredisa]

Just adding, the operator, or operators should keep using the same rip ticket template when printing your file. I mean, for example there is a hot folder or an output option named EPM (Enhanced Productivity Mode), where all blacks are converted to CMY only. The mentioned output is intended to print a CMYK only with CMY, simulating the black areas with these inks, as a way to lower costs when printing, but it has a negative impact if you're printing a pure black image because, only CMY will never look like a pure black printing. This is just another example of what can be done on a HP Indigo, of course the first thing to look is what mantman said.

 

[INK_white]

two answers both very professional

 

[rolermanto]

Hello guys... after all Simon can you tell us if you are satisfied? ;-)
New member, one post, 2 solutions... and it's finished here?
))