JeffGreenberg

CS6: why does ACR have blue-yellow, magenta-green, but no red-cyan slider???

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Why????  Why why why!!!!!!!!!!!!!!!???

AFAICT, can't adjust red-cyan balance until converting to 16bitTIF....

Is it offered in CC or Lightroom?

What it is, is this:

adding red to RAWs-DNGs...

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You only need two sliders to get any combo of colour. Think colour triangles. You add Yellow and Magenta to get Red and so on.

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11 hours ago, MDM said:

You only need two sliders to get any combo of colour...Yellow and Magenta to get Red and so on.

 

True.  But then why does CS6 offer (3) color sliders for TIF processing?

Moving just red slider gives differing results (maybe less yellow-magenta leakage) vs. moving magenta+yellow slider

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The simple answer is that it is overkill to give all three controls in the Color Balance Adjustment in Photoshop. It is completely unnecessary. Adding 40 Red or adding 40 Yellow + 40 Magenta gives exactly the same result. Two controls would be sufficient for all purposes. There is no colour leakage whatever that means. Try it. One image with +40R, another with +40 Y + 40M. Absolutely identical. EIther use adjustment layers on a single file or duplicate a file and try it on the two separate images if you can't use adjustment layers.

 

I haven't time to explain basic colour theory (elementary science really) to you but if you search for colour (color) triangle on the internet then I am sure you will find a good explanation if you want the theory - it is simple and it is worth understanding. 

 

 

Edited by MDM

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We are all used to using the RGB colour system, or even CMYK, but if you look at LAB mode in Photoshop, you will see the colour controls are similar to Lightroom's in their effect: L controls brightness/exposure, while the A and B channels correspond to the magenta/green and yellow/blue sliders you see in Lightroom.  It's worth looking at a curve in Photoshop in LAB mode and playing with the three channels to see what can be achieved with these adjustments.  So Lightroom gives you a bit of the best of both worlds: the equivalent of RGB and LAB adjustments without having to switch modes.

 

Graham

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