Saving channels to png

[cjl6892274]

How do I save RGB specific channels as a png? Whenever I try to save the image with channels disabled the file saves with all channels enabled. If I switch from RGB I lose the option to save as a png.

[davescm]

Hi

This is one way:

Use Image >Calculations to create a new document with just the required channel (e.g. here I've shown the red channel).

In the new document change the Image mode from multichannel to grayscale

Save As png

Dave

[D Fosse · Accepted solution]

Target the channel you want - just click on it in the channels panel - and copy it into a new file. Save/Export that as PNG.

Target channel. Ctrl A - ctrl C - ctrl N - ctrl V - ctrl E. Save. Do that a few times and it sticks...

Yeah, Calculations works too.

[cjl6892274]

Interesting but that doesn't appear to work. The image loses all it's color. Tried it using both Blue and Green and then merging the 2 documents but it just came out as grey scale.

Fosse's method worked though.

Thanks to both of you for responding.

[davescm]

Hi

I obviously misunderstood your requirement . You said you did not want an RGB document. A single channel Red/Blue or green on its own is just greyscale - it does not have colour info until you put it into an RGB or CMYK document.

Dave

[cjl6892274]

Your right, I should have been clearer in the question. I only wanted to remove a single channel but maintain the other channel colors. I only attempted to switch from RGB because from what I read online that allowed channels to be saved, but as I mentioned in the original question, switching from RGB didn't allow me to save as png which I required.

Thanks again.

[D Fosse]

cjl6892274  wrote

The image loses all it's color.

Yes, as Dave said, that's what a single channel is. It's just a grayscale image. If you expect the green channel to be green, then you misunderstood.

And if you then got my method to "work" something is very wrong

[cjl6892274]

Fosse, not sure why your method worked, maybe because 2 channels were copied it maintained both those selected channels when pasting into the new image and since it was more then 1 channel it didn't switch to grey scale.

I tried using the calculation method with image 1 using 1 channel and image 2 using a different channel but that still left me with a grey scale image.

I had also previously tried adjusting the hue but the result was different from just disabling 1 of the channels although it likely would have worked if I'd made further adjustments to get the right colors and brightness.

Thanks again.