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White colour

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  #1  
Old 05-30-2010, 03:19 AM
czerwony czerwony is offline
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White colour

I'm working on a b/w portrait shot in studio. The photographer asked me to change the background to white. It's grey currently. The image may go to print/magazine. What's the white color, in numbers, that will correctly appear in print. That there still will be some details printed, not burned out?

Thanks
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Old 05-30-2010, 08:02 AM
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Flora Flora is offline
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Re: White colour

Hi czerwony,

Is it something like this? (Attachment 1)

As for the numbers, as far as I know,

0 = Pure Black
128 = 50% Grey
255 = Pure White

Pure Black, or nearly so, and Pure White, or nearly so, in an image/portrait are solid blocks which contain no details whatsoever, so, while in my example I used Pure White for the background ..
Quote:
Originally Posted by czerwony
The photographer asked me to change the background to white
.. I adapted the portrait itself to gradations of greys so it would blend better with the new, much brighter Background while still keeping all the details. (No solid block Shadows, nor blown out Highlights)

Hope this was what you wished to know ....


Attached Images
File Type: jpg Grey-To-White.jpg (190.2 KB, 93 views)
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Old 06-01-2010, 07:56 AM
czerwony czerwony is offline
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Re: White colour

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Originally Posted by Flora View Post
Hi czerwony,
0 = Pure Black
128 = 50% Grey
255 = Pure White
Thanks Flora. The background on your attachment exactly shows what I need to do on my image.

If I change the background to white using 255 white would that mean the printer wont use any ink to print the white areas as there will be no details?

Is this what the mags accept or is it better to use a lower number, let say 245 to still keep it fairly white but with some details?
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Old 06-01-2010, 09:45 AM
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Re: White colour

Quote:
Originally Posted by czerwony View Post
Is this what the mags accept or is it better to use a lower number, let say 245 to still keep it fairly white but with some details?
yes its better to have some information on the file what goes for print, and just like U said 245 for white and something like 10 for black.
if You will have 255 for white it will print with that weird transition between ink and space with no info whatsoever...
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Old 06-01-2010, 11:17 AM
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andrewrodney andrewrodney is offline
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Re: White colour

Quote:
Originally Posted by czerwony View Post
Is this what the mags accept or is it better to use a lower number, let say 245 to still keep it fairly white but with some details?
It depends on how the RGB document is converted to CMYK (is a good ICC profile, representing the press conditions being used)? If so 255 would be fine and ensure no ink (just paper white) since the ideal conversion takes place from this profile. There are no hard and fast rules here (245/10). Very old school, general hit the side of a barn values.
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Old 06-01-2010, 11:49 AM
SilvaFox SilvaFox is offline
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Re: White colour

A highlight dot for print is C3, M2, Y2, K0
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Old 06-01-2010, 12:04 PM
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andrewrodney andrewrodney is offline
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Re: White colour

Quote:
Originally Posted by SilvaFox View Post
A highlight dot for print is C3, M2, Y2, K0
To WHAT device? They are all different. Proving values without defining the print conditions is folly.

Take 255/255/255 and convert to a number of output profiles, you always get 0/0/0/0.

Take the so called “correct” 245/245/245 and convert in Adobe RGB (1998) (the working space will play a role in the numbers you get):

FOGRA27 4/3/3/0

US Sheetfed V2 3/2/2/0

US Newsprint is 2/2/2/0

Indigo HP7000 on Lettra paper 6/5/6/0

Xeikon on MC paper 4/3/3/0

You get differing values from the identical source Adobe RGB (1998) numbers because CMYK is highly device dependent. Only having a profile that correctly defines the printing conditions (and paper) can one supply numbers. You need to define the source color space AND the destination color space too. Those providing values without this info are simply providing numbers with no basis on reality.
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Old 06-01-2010, 02:47 PM
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flexmanta flexmanta is offline
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Re: White colour

It's a good practice to create a solid color layer with the choosen white as the last step of a print retouch, and blend it darken. That way, there will be no brighter color than the whitest white you choose.
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Old 06-01-2010, 11:58 PM
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Re: White colour

Great stuff!!!!

Thank you so much for all your tips!

czerwony,

you are welcome!
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  #10  
Old 06-02-2010, 05:00 AM
Fact Fact is offline
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Smile Re: White colour

Quote:
Originally Posted by flexmanta View Post
It's a good practice to create a solid color layer with the choosen white as the last step of a print retouch, and blend it darken. That way, there will be no brighter color than the whitest white you choose.
Thanks Flex, an interesting advice.
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