davide445 Posted September 24, 2019 Share Posted September 24, 2019 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. Quote Affinity Photo, Publisher, Designer, PagePlus, ShaderMap Pro, Davinci Resolve, HitFilm Pro, Unreal, Unigine, 3ds Max, Maya Bifrost, Houdini, 3D-Coat. Windows 10 and 11 Pro. Link to comment Share on other sites More sharing options...
Staff Callum Posted September 25, 2019 Staff Share Posted September 25, 2019 Hi Davide445, Welcome to the forums, The attached video should show how to do what you are looking for Thanks C Red_channel.mov Quote Please tag me using @ in your reply so I can be sure to respond ASAP. Link to comment Share on other sites More sharing options...
davide445 Posted October 18, 2019 Author Share Posted October 18, 2019 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? Quote Affinity Photo, Publisher, Designer, PagePlus, ShaderMap Pro, Davinci Resolve, HitFilm Pro, Unreal, Unigine, 3ds Max, Maya Bifrost, Houdini, 3D-Coat. Windows 10 and 11 Pro. Link to comment Share on other sites More sharing options...
Staff Callum Posted October 18, 2019 Staff Share Posted October 18, 2019 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 Quote Please tag me using @ in your reply so I can be sure to respond ASAP. Link to comment Share on other sites More sharing options...
firstdefence Posted October 18, 2019 Share Posted October 18, 2019 What about just turning off the green and blue channels? Quote iMac 27" 2019 Somona 14.3.1, iMac 27" Affinity Designer, Photo & Publisher V1 & V2, Adobe, Inkscape, Vectorstyler, Blender, C4D, Sketchup + more... XP-Pen Artist-22E, - iPad Pro 12.9 (Please refrain from licking the screen while using this forum) Affinity Help - Affinity Desktop Tutorials - Feedback - FAQ - most asked questions Link to comment Share on other sites More sharing options...
R C-R Posted October 19, 2019 Share Posted October 19, 2019 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. Quote All 3 1.10.8, & all 3 V2.4.1 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7 Affinity Photo 1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7 Link to comment Share on other sites More sharing options...
Staff James Ritson Posted October 19, 2019 Staff Share Posted October 19, 2019 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! davide445 and Przemysław 2 Quote Product Expert (Affinity Photo) & Product Expert Team Leader @JamesR_Affinity for tutorial sneak peeks and more Official Affinity Photo tutorials Link to comment Share on other sites More sharing options...
R C-R Posted October 19, 2019 Share Posted October 19, 2019 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. EDIT: with your 'height map' clue I just now found this forum topic, which suggests the Greyscale 16-bit export should work. Quote All 3 1.10.8, & all 3 V2.4.1 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7 Affinity Photo 1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7 Link to comment Share on other sites More sharing options...
davide445 Posted October 22, 2019 Author Share Posted October 22, 2019 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. Quote Affinity Photo, Publisher, Designer, PagePlus, ShaderMap Pro, Davinci Resolve, HitFilm Pro, Unreal, Unigine, 3ds Max, Maya Bifrost, Houdini, 3D-Coat. Windows 10 and 11 Pro. Link to comment Share on other sites More sharing options...
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