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kiekelly
11-29-2006, 06:48 AM
Hi There,

I'm a UK based Graphic/Web Designer and have a question that's been bugging me for a while...

What is the Correct Colour Calabration setup for using: A 1.33 Aluminium PowerbookG4 (10.4.8) running the Default Colour LCD Profile (from System Prefs > Color )

What RGB setup should be running in Photoshop CS 2 ? I have it set to: Monitor RGB - Colour LCD at the moment, which is fine when I'm opening stuff in Photoshop - however when I export it say as a PNG it renders lighter in Firefox ? which is the true colour .... I find this very confusing - basically it looks to me the Photoshop is making things Darker than they reallly Are :(...

Please help, very stuck!

cheers Kie

Boots
11-29-2006, 01:38 PM
Ideally you would calibrate your monitor with a hardware/software kit like MonacoOptix for the most accurate monitor profile.
Short of that you can use the calibrate feature in System Preferences>Displays>Color tab to make a 'custom' monitor profile.

Photoshop automatically detects the monitor profile in use and factors it in when converting colors.
When exporting for web display, you should tag the image with the sRGB profile.
Some browsers are 'ColorSync'-aware- meaning they will detect the embedded profile in an image and compensate. Other browsers are not. Not sure about Firefox.

What is the 'working space' profile of the image in Photoshop?

kiekelly
11-30-2006, 02:03 AM
hi, thanks for the feedback - all images see to have the Colour -LCD profile, the Powerbooks default setting - I don't need to recalibrate that, because I'm happy with the way the colours look, changing the gamma etc makes the screen to blue or yello.....

Actually looking at the image in Safari the image is fine, I guess the issue is then, why does firefox 2.0 display images brighter? here's a link for the PNG in question...

http://kierankelly.net/SiteCreatorTemplates/newwamtagfront.html

thanks :)

kieran

Boots
11-30-2006, 12:48 PM
Yes, I see the difference your describing in the image.

Sounds like this is a possible solution:

http://www.istockphoto.com/forum_messages.php?threadid=42023&page=1

Nicolas
11-30-2006, 03:32 PM
Well, we are using an Gretag Macbeth SpectroScan, costly thingy doing the calibration of Scanners, Digicams, Monitors/LCDs and Printer.
In Colorsync there should be Profiles:
Monitor: Your Monitor calibrated.icc (at least use the build in OSX calibration and your eyes)
RGB: ECI RGB.icc
CMYK: Iso Coated.icc (If your are doing things for print)

But, in Europe, other than in the US which is using SWOP coated, we are using Euroscale for CMYK adn most Profiles are comming from the FOGRA/UGRA their profiles can be freely downloaded at ECI http://www.fogra.org/ for example if ya need a profile for Offset, 60 to 80 screening, you should use ISO coated.
http://www.fogra.org/products-en/icc1.html
Downloadable here:
http://www.eci.org/eci/en/060_downloads.php

For RGB there is the ECI (ECIRGB which has a bigger range than the Adobe RGB colorspace)
Downloadable here:
http://www.eci.org/eci/en/060_downloads.php
They also have tools for checking your calibration, monitors and printer.
Their Altona Test Suit is pretty good.
Also control strips for your proof printer and new, your digicam.

If you are doing things for web remember that Macs have set the Gamma to 1.8 and PCs to 2.2 ;)

Regards

Nicolas

kiekelly
12-04-2006, 11:01 AM
Thanks Guy's

this is something that has puzzeled me for ages!! so if I'm working as a Mac Based Web Desinger my Photoshop RGB profile should be set to sRGB - to replicate a PC display? and then your suggesting saving with out a colour Profile.....

any other Web Designer dudes out theres?

Cheers

Kie

Nicolas
12-05-2006, 12:22 AM
Thanks Guy's

this is something that has puzzeled me for ages!! so if I'm working as a Mac Based Web Desinger my Photoshop RGB profile should be set to sRGB - to replicate a PC display? and then your suggesting saving with out a colour Profile.....

any other Web Designer dudes out theres?

Cheers

Kie
NO, your display should be calibrated as it is your Monitor, only for your working RGB colorspace use the sRGB profile.

Or if you are doing both (print and web) use ECI RGB as your RGB profile and then apply the via "Modus>convert Image into Profile color space " sRGB.

Colorsync is doing the rendering so the image apears on your your monitor as it is using the embedded profile :)

Regards

Nicolas

kiekelly
12-05-2006, 02:16 AM
Cheers Nicolas..

SO I need to have my Powerbook:

System Prefs > Displays > (set on default) color LCD ?

But I also do Print/Web work - are you suggesting this profile should be

System Prefs > Displays > CIE RGB ? (I can't see ECI RGB so I presumed it was a typo? )

----

My Photoshop/Illustrator should then be calibrated to match this setting, and then when I'm working for web I need to Convert the working space to SRGB

----

Apologies for reiterating the same reply as yours (almost) I've worked as a Designer for 10 years and still can't figure this out 100% :(

Nicolas
12-05-2006, 03:50 AM
No, on displays it should be your monitor profile (if you don't have a hardware tool calibrate via the software and your eyes)

In PS it should be:

RGB: ECI-RGB.icc
CMYK: ISO Coated
Gray: Gamma 1.8

So you can do both The ECI-RGB profile has a bigger range than sRGB, Adobe RGB and ISO Coated so it is perfect cuz you will not losing information when converting an Adobe RGB, sRGB or an CMYK image o the ECI colorspace.

Regards

Nicolas