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Separating Colour Tones Before The Black and White Conversion


Sometimes we are faced with tones in the colour image which have a similar value. It is the similarity of these tones which could lead to issues after the black and white conversion has taken place.

We run the risk of these tones blending into one another and becoming the same shade of grey.

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Re: Separating Colour Tones Before The Black and White Conversion


Thanks for this Ian.

Although my software - PSE 11 - doesn't come with a B&W adjustment layer I was able to find an action that provides it (along with others).

I've had a go at this method and was [sign in to see URL] it as simple as pushing the sliders to extremes (as a starting point at least) to get maximum separation or is that too simplistic an approach and you need to rely totally on judgement.

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Re: Separating Colour Tones Before The Black and White Conversion


thanks In , this is similar to what I tend to use in LR with the B+W sliders , when I see I dont get teh tonal separation from desaturating

Why do we set the blending mode to Luminosity rather tha normal?


I mean I see what it does but how does it do it's magic...?
thanks

Last edited by Digital Finger, 4/Aug/15, 9:20 pm


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Re: Separating Colour Tones Before The Black and White Conversion


what difference is there ( if any) between doing this and simply moving the sliders with blending mode set to normal?

I can't work it out

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Re: Separating Colour Tones Before The Black and White Conversion


quote:

Digital Finger wrote:

what difference is there ( if any) between doing this and simply moving the sliders with blending mode set to normal?

I can't work it out



By setting the blending mode to Normal, you are changing Luminosity and not saturation or Hue. We only want to change brightness



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Re: Separating Colour Tones Before The Black and White Conversion


quote:

IanBarber wrote:

By setting the blending mode to Normal, you are changing Luminosity and not saturation or Hue. We only want to change brightness




sorry still don't get it (no surprise there really) emoticon

"by setting blend mode to normal you are changing luminosity"...er OK ...why is it called luminosity blend mode if thats not also what it does (really don't know)

are you saying that the luminosity blend mode changes only brightness, and normal mode changes luminosity?

absolutely baffled here emoticon

i.e. does not it do the same thing just adjusting the sliders in normal mode? I can't see any difference between doing that and doing it first with blending mode set to luminosity and adding a mono adjustment layer on that-it still need the sliders adjusting?

Im even more baffled because I thought you said you were colour blind so how can you see the luminosity blendd adjustments of the mono adjustment layer if they're in colour?

I suspect I have got something majorly arse about face here!

Last edited by Digital Finger, 8/Aug/15, 10:52 pm


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Re: Separating Colour Tones Before The Black and White Conversion


When I refer to changing the blending mode to Luminosity to separate tonal values, I am working on the colour image prior to black and white conversion.

I assume you are doing this ?

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Re: Separating Colour Tones Before The Black and White Conversion


yes

I still don't get [sign in to see URL] it lots last night trying to understand what the advantage was supposed to be but I just can't see the sense in it

I know it must be there because you know helluva lot more about Ps than I do - real trouble getting my head round this one

Last edited by Digital Finger, 9/Aug/15, 9:45 am


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I am a part of what I am, not apart from what I dream,
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Re: Separating Colour Tones Before The Black and White Conversion




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Re: Separating Colour Tones Before The Black and White Conversion


ok tried that thanks for that

[sign in to see URL] can't you just do the same with the sliders in normal blend mode and mask the same way - and add a B+W again on top?

won't you get the same effect?

---
I am a part of what I am, not apart from what I dream,
That's a part of what I seem, but not apart from what I am

~ Simon
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