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Elines Profile
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Selective use of B&W adjustment layer


Could someone point me to a video on how to use a B&W adjustment layer for selective adjustments to parts of an image based on the location in the image rather than just the colour?

In more detail .....

Suppose that you have a colour image and that as part of your workflow you want to increase eventual B&W contrast by using a B&W adjustment layer.

Now suppose that the image is mainly yellow (or blue or green etc) and you want to lighten some of the yellows in one part of the image, and darken other yellows in another part.

Despite searching on t'internet I can't work out how do that.

I know that you use a mask as I am familiar with using black masks to paint in adjustments to tones arising from, say, a curves or levels adjustment layer.

But in the case of a B&W adjustment layer when I try to paint in the effect I uncover the underlying colour image and so can't see if I am getting the effect I want.

In addition to internet searches I have tried several random approaches but not found one that does what I want emoticon

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Chris

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17/Oct/15, 3:39 pm Link to this post Send Email to Elines   Send PM to Elines Blog
 
IanBarber Profile
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Re: Selective use of B&W adjustment layer


Have you tried changing the blend mode of the bw adjustment layer to luminosity and adjust the luminance of the colours before doing the final bw conversion ?

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17/Oct/15, 4:22 pm Link to this post Send Email to IanBarber   Send PM to IanBarber
 
Elines Profile
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Re: Selective use of B&W adjustment layer


I want a process whereby the image is in B&W and I can see the effect I am having by:

- altering B&W adjustment sliders on the entire image whilst it is in B&W.

- selectively painting in the B&W adjustment to only part of the B&W image

Perhaps this will make it easier to see what I am trying to say.

This image is basically yellow all over and I want to be able to darken some bits and lighten others. All the videos I have found conveniently use images that have different colours so that you can use different sliders. That won't work with this image as only the yellow slider has much effect .

Start point

--Log in or sign up to see linked image content--

Step 2 - adjust shades using B&W adjustment layer (over exaggerated to illustrate).

--Log in or sign up to see linked image content--

Step 3 - try to paint in effect in only part of the image

--Log in or sign up to see linked image content--


I know that I am missing something pretty obvious.

And I did try creating an initial, base conversion to B&W and then creating another B&W adjustment layer aboe it to do the actual amendments but I couldnt work out what to do.

It may well be that I AM painting in the effect I want but as it is in colour and NOT in B&W I can't actually see it.

I would be making the change in layer type to 'Luminosity' when I had made the changes and been able to see them in B&W (normal) mode.

Hope that is clearer emoticon

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17/Oct/15, 5:01 pm Link to this post Send Email to Elines   Send PM to Elines Blog
 
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Re: Selective use of B&W adjustment layer


I am not 100% clear on your objectives here.

Come and have a chat with me via Audio Chris to see if I understand you

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17/Oct/15, 5:11 pm Link to this post Send Email to IanBarber   Send PM to IanBarber
 
Norman2 Profile
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Re: Selective use of B&W adjustment layer


Chris, I have had a look at your second image and to me it has a bit more life about it. On a point of interest I never use the B&W Adjustment layer, once I have converted using Channel Mixer, I can do most of the rest by selective Curves etc.

Norman
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Elines Profile
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Re: Selective use of B&W adjustment layer


OK Ian, will contact you tomorrow.

And ..just to try again... I know how to apply the B&W adjustment layer to the whole image but not to just part of it(eg to just one corner)

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17/Oct/15, 5:39 pm Link to this post Send Email to Elines   Send PM to Elines Blog
 
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Re: Selective use of B&W adjustment layer


quote:

Elines wrote:

OK Ian, will contact you tomorrow.

And ..just to try again... I know how to apply the B&W adjustment layer to the whole image but not to just part of it(eg to just one corner)



Make a selection of the corner you want to adjust

Add the Black and white adjustment layer to only effect that area made by the selection


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17/Oct/15, 5:45 pm Link to this post Send Email to IanBarber   Send PM to IanBarber
 
IanBarber Profile
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Re: Selective use of B&W adjustment layer


--Log in or sign up to see linked image content--

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Photoshop Panels - Actions - eBooks and more..
http://www.digitalblackandwhite.co.uk

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17/Oct/15, 5:50 pm Link to this post Send Email to IanBarber   Send PM to IanBarber
 
Elines Profile
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Re: Selective use of B&W adjustment layer


Thanks for this Ian.

Will give it ago but I tried something like this and not sure it's what I want so will contact you to discuss

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Chris

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17/Oct/15, 6:27 pm Link to this post Send Email to Elines   Send PM to Elines Blog
 
Elines Profile
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Re: Selective use of B&W adjustment layer


Norman - just seen that you replied at the same time as me


I've never used channels. They weren't a standard part of Elements and although I had a plug-in that made them available I never learned how to use them or what they were for.


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Chris

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17/Oct/15, 8:26 pm Link to this post Send Email to Elines   Send PM to Elines Blog
 
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