Photoshop: How to swap red and blue channels...?

[theMusicMan]

Hi All

I have been reading some tut's on IR processing, and for 99.9% of my PP I use LR2.4. However, one article I have read on processing IR images suggests that one process could use swapping the Red and Blue channels in Photoshop - but I have no clue how to do that.

Anyone able to offer some pointers please...?

I can't even seem to find the channel mixer as it's greyed out!

Ta

 

[68lbs]

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[Yv]

Que??



No idea John, could it be done using the red and blue adjustment in curves if the channel mixer is greyed out? Or, if its greyed out, is it to do with the colour mode the images are in? RGB, CMKY, Lab Colour, etc? :shrug:



YES!! I know, befora anyone says it, probably a stupid suggestion

 

[louise-knight]

WhIch version of ps do you have? See if having your image sRGB & 8bit helps.. If not, no idea, sorry! But to swap the channels once you get into the channel mixer, select the blue channel & set blue to 0% then red to 100%, then select the red channel & set red to 0% & blue to 100%.

Good luck, hope you manage to get into that mixer!!

 

[swanseamale47]

I suspect you have selected one channel on the channels palette, you need to be on the rgb image (at the top of the channels) to access the channel mixer.

 

[Flash In The Pan]

It's fairly straight forward to do a channel swap in Photoshop (if you can get into it that is), when you open each of the colours up you'll see that each one is made up of RBG, so to swap red->blue open the RED channel and pull the RED slider down to 0% and put the BLUE one up to 100%, then open the BLUE channel and put BLUE at 0% and RED at 100%.

You might want to play around with the values, say maybe 5% and 95%, but the numbers have to add up to 100, so not 95% and 75%