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Want to save an image with just the red channel enabled instead of the whole RGB.

I can't find a way to achieve this, but sure there is one.


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Seems this is generating still an RGB image and not a single channel. 

There is not such a control for enabling or disabling color channels in Photo? 

editor.png.40101d4607b20b566a5f893eac96a


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You can disable channels from the channels tab towards the bottom right of the app. Does following the steps in my video not export a red image for you?

Thanks

C

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What about just turning off the green and blue channels?

Screen-Shot-2019-10-18-at-18-35-45.png


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15 hours ago, davide445 said:

Seems this is generating still an RGB image and not a single channel. 

Yes, it results in an RGB format document but that is what you asked for -- one in which just the red channel is enabled. AFAIK, there is no such thing as a single channel "Red only" image format.

What specifically do you want to use the red channel for? If we knew that we might be able to suggest the best way to do that in AP.


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5 hours ago, R C-R said:

Yes, it results in an RGB format document but that is what you asked for -- one in which just the red channel is enabled. AFAIK, there is no such thing as a single channel "Red only" image format.

What specifically do you want to use the red channel for? If we knew that we might be able to suggest the best way to do that in AP.

R16 is a single channel format that contains red channel information—it's typically used for height maps in landscape creation software/game engines etc.

Affinity Photo doesn't have any direct R16 export capabilities. However, you could try the following @davide445 :

  • Flatten your document if you have layer work (Document>Flatten).
  • On the Channels panel, scroll down and right click Pixel Green then choose Clear. Do the same with Pixel Blue. Note that Pixel will be whatever your layer is named (so it might be Background if you haven't flattened your document). Ignore the Composite channels at the top as they won't offer the option to clear the channel data.
  • You should now be left with just red channel information.
  • Go to File>Export and choose the PNG format. Click the More button and find Pixel format. Choose Greyscale 16-bit from the dropdown and then export.

Your mileage may vary with this—some people have reported success importing these 16-bit greyscale PNGs into the software they're using.

Alternatively, if you don't specifically need the greyscale bitmap and just wanted to export an RGB image with only the red channel data, ignore the PNG export steps and just use whatever format you wish. Hope that helps!


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35 minutes ago, James Ritson said:

R16 is a single channel format that contains red channel information—it's typically used for height maps in landscape creation software/game engines etc.

Thanks for that info. I searched the web for "R16 format" but I kept getting results suggesting it was the format of Norton Ghost rar files. xD

EDIT: with your 'height map' clue I just now found this forum topic, which suggests the Greyscale 16-bit export should work.


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Apologize for not answering before, need to finish the 3D topic I was working on.

Yes as @James Ritson state it's a format used for realtime engines heightmaps.

I discovered with Houdini I can directly export in the correct heightmap format, but is useful to have also a pipeline with AP to fast correct them if the landscape didn't come from Houdini.

Btw I just used AP for patching a boken heightmap coming from a cartographic source, so always useful tool here.


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