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colorizing a black object

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  #1  
Old 03-11-2012, 09:11 AM
murimurano murimurano is offline
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colorizing a black object

Hi,
i'm trying to figure out how to best change the color of a black object without losing texture.
Below is an image of a cutlery set with black handles. I would like to change the handles to orange. The handles are made of black textured plastic. Since they are black to begin with, i can't change the hue, or use the channel mixer etc.
Filling a layer above the image with the desired color then changing the blending mode to lighten or screen etc didn't change the color in a realistic manner either.
Any suggestions how to do the task correctly?

Thanks in advance
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File Type: jpg cutlery2-1.jpg (64.2 KB, 64 views)
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Old 03-11-2012, 11:39 AM
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Crapaud Crapaud is offline
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Re: colorizing a black object

Lab colour is the easiest way, murimurano.

Create a mask of the handles. convert to Lab and in a curves adjustment layer set the Lab values to those of your chosen orange. Apply mask and, hey presto ...
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File Type: jpg cutlery2-1_orange.jpg (72.7 KB, 107 views)
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Old 03-11-2012, 11:40 AM
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hawkeye60 hawkeye60 is offline
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Re: colorizing a black object

Hue/sat adjustment layer set to colorize and screen mode. Obviously I didn't do all the masking and tweeking that's should be done.
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File Type: jpg ScreenShot001.jpg (47.4 KB, 88 views)
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Old 03-11-2012, 11:52 AM
murimurano murimurano is offline
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Re: colorizing a black object

Quote:
Originally Posted by Crapaud View Post
Lab colour is the easiest way, murimurano.

Create a mask of the handles. convert to Lab and in a curves adjustment layer set the Lab values to those of your chosen orange. Apply mask and, hey presto ...

your sample looks fantastic.

Can you please explain in detail how to arrive at your result and why lab color works best? What i'm most surprised with is that all the shadows and detail remained using your method.

FYI - i need the end result to be in CMYK

Thank you very much
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Old 03-11-2012, 12:23 PM
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hawkeye60 hawkeye60 is offline
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Re: colorizing a black object

Excellent method, I confess I thought of it but didn't try it. Adjust the a channel with curves and then mask as necessary.
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File Type: jpg ScreenShot003.jpg (66.3 KB, 75 views)
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Old 03-11-2012, 12:46 PM
murimurano murimurano is offline
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Re: colorizing a black object

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Originally Posted by hawkeye60 View Post
Excellent method, I confess I thought of it but didn't try it. Adjust the a channel with curves and then mask as necessary.
I tried replicating your method and the handles didnt take on the new color, it's basically still black with some color overlayed. Can you explain how you get the handles to take on the color while still keeping the highlights/shadows/detail intact? Attached is my attempt
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File Type: jpg mySample-1.jpg (92.5 KB, 50 views)
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Old 03-11-2012, 01:04 PM
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hawkeye60 hawkeye60 is offline
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Re: colorizing a black object

I hope I'm not stepping on murimurano's toes by responding to you. Many thanks to him for pointing out the method.

You are there, as far as I can see. If you do all the masking it should look fine. Bear in mind you can try different blending modes on the adjustment layer and vary the opacity to get the look you're after. Here it is in screen mode at 100% opacity, for instance.
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File Type: jpg ScreenShot004.jpg (30.6 KB, 54 views)
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Old 03-11-2012, 02:32 PM
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Crapaud Crapaud is offline
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Re: colorizing a black object

Quote:
Originally Posted by murimurano View Post
your sample looks fantastic.

Can you please explain in detail how to arrive at your result and why lab color works best? What i'm most surprised with is that all the shadows and detail remained using your method.

FYI - i need the end result to be in CMYK

Thank you very much
The reason it works so well is that when you convert to Lab all the detail migrates to the L channel and the colour goes to the a and b channels. Here we're changing the colour so the greatest shift will be there. Of course the L channel changes as well, but, if neccessary you could anchor the highlights and shadows I like the result withiout anchors - i feel it's more natural, but it's your image.

The trick is to know your input (the original) values and your output (target colour) values. I chose L59, a 47, b 66 at random. The original values were L 35, a 0, b -1. Simply type in the values as in the curves attachment.

Another advantage of this method is precision - if the numbers are rright, the colour will be too.
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File Type: gif cutlery-curves.gif (40.0 KB, 42 views)
File Type: jpg precise_colour.jpg (98.2 KB, 60 views)

Last edited by Crapaud; 03-11-2012 at 02:38 PM. Reason: posted by accident before finishing
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Old 03-11-2012, 03:42 PM
murimurano murimurano is offline
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Re: colorizing a black object

thank you for all your help...i will have to play around with the LAB color space, i'm not very familiar.
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Old 03-11-2012, 04:10 PM
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hawkeye60 hawkeye60 is offline
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Re: colorizing a black object

A picture is worth a thousand words. Go to the channels palette and turn off the lightness channel. Then turn off just the a&b channels.
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