Adobe RGB V sRGB

[JMugs]

Pisq.
I suspect you are giving me a poke, a nudge and a wink there..
If I understand this correctly, the ICC is built around CMYK, but the provision of 7 colours allows a wider gamut. So CMYK 4 colour profile yes, generated by the use of 7 colours.

That is of course if I have understood correctly.

Janners

[pisquee]

The ICC tells your printer how to mix your 7 colours to get the best reproduction of colours, I don't think that the ICC software 'knows' that you have a 4 or 7 colour printer - I think that is more down to how the printer driver translates the information from the computer software before sending it over to the printer.

[JMugs]

Pisq.
Got it .... I think.

Janners

[Paul]

Tim is right. Icc making software hAs no clue how many ink carts is in your printer. Thats why you need to print 100's of color charts to tell your icc what can be done


reference to cameras set to srgb. This is true. But this is srgb is a standard in monitors and browsers. Most pros is changing that to adobe rgb.

[nicspics]

just a note regarding adobe 98. If you happen to be sending images to a photo minilab to print such as a Dlab 1 or some of the fuji frontiers (most high street shops use these) then images are prefered in srgb colourspace or even better profiled to the machine you are sending to. (probably off on a tangent from this thread but as this is my main business thought I would mention it )
thanks

Nick

[pisquee]

Or a lot of commercial printers will want to receive images in CMYK and not RGB at all.

[chrissydd]

A really helpful thread Thank you

[mags1892]

OK Srgb has a smaller colour space than Adobe RGB , and srgb over laps some cmyk in some areas and vice versa. However most photo labs use Srgb to reproduce photos and its good enough for them . However adobe rgb will give a bigger colur space. Pro Photo a HUGE colour space (which in fact is the colourspace of RAW file format from cameras) However youll get some weird artifacts if you print it depending on the image.
To err on the safe side for images use Srgb with perceptual and if you need good bright colours in flat artwork adobe rgb would be better using relative colour intent. (unless you have vingiettes )

Confused ? lol if you need mor einfo im only too happy to explain the relationships between rendering intents and colourspaces and Profile connection spaces

[chrissydd]

Mags1892, I'd seriously LOVE you to explain those relationships if you didn't mind?!! I'm creating my own images in illustrator and many have flat bold colours within the back ground. Currently my settings are adobe rbg with perceptual...for no other reason than some instructions I had. I'd love more explanation :):):):) Thank you x

[mags1892]

Mags1892, I'd seriously LOVE you to explain those relationships if you didn't mind?!! I'm creating my own images in illustrator and many have flat bold colours within the back ground. Currently my settings are adobe rbg with perceptual...for no other reason than some instructions I had. I'd love more explanation :):):):) Thank you x

Rendering intents likeperceptual reletive etc are for OUT OF GAMUT colours only they are algorithms which bring the OUT of GAMUT colours into the colour space of the destination device IE the printer ink paper combination you have. Perceptual will take the furthest out of gamut colour and compress this into the in gamut colour space whiclst also altering all the colours already INGAMUT in essence shrinking the whole colour space to fit in the printer colour space. So colours that WERE exactly correct no longer are because of the out of gamut colour having to be brought in line. The benefit however is the relationship between colours is kept ie a vignette wtill is a smooth vignette.

Relative however will shrink the out of gamut colours into the colour space of the printer but will LEAVE alone any colour already in GAMUT, this is more accurate for colours but doesnt keep the relationship hence you can get a horrible flat area in a vignette so you pick your intents carefully, Sawgras suggest perceptual as its easiest to work with whilst not being necessarilly the best for a particular job.

The maths behind it is all in the profile wich is a table of colours generated from the measurement data , this is all converted from wavelength data to LAB which is the mathematical description of colour.