I am creating color profile for inkjet printer
I want to know how to convert LAB to CMYK and reversion
Thanks a lot
This can be done through one of the Adobe type applications such as Photoshop, however it is very important that you understand that the result will depend on your colour management settings within the application. CMYK is device specific and NOT generic, and so to do this conversion properly you must first know the device profile for CMYK that you would like to convert your LAB data to.
The way an ICC profile is produced is by printing a “target” (a series of patches of colour that characterise colour on that device) on the printer, software and paper combination and then measure this back in using a spectrophotometer. After measuring this in the software that drives the printer (such as some rips) or the software that comes with the spectrophotometer will generate an ICC file that can be used for colour accurate printing.
This ICC profile is effectively a LUT (look up table) as an example, for LAB to CMYK or CMYK to LAB. to complete this conversion from a colour space other than LAB it requires 2 profiles – both an input and an output profile.
An example of typically how this works as follows:
CMYK > LAB < CMYK
RGB > LAB < CMYK
see also this website:
Learn> Colour> Basics> What is a “Colour / ICC Profile”
Please feel free to ask further if this is not entirely clear