Jump to content
You must now use your email address to sign in [click for more info] ×

Channel filtering in Blend Ranges


Recommended Posts

I've recently tried to simulate low colour bitdepth in AP using posterize and layer blend ranges.

 

( see this post https://forum.affinity.serif.com/index.php?/topic/40899-using-posterize-to-simulate-low-bit-depths-in-ap/ )

 

But I realised I couldn't filter out whole colour channels using the blend option graphs.

 

So the feature that would solve this (and be useful for other things) is the addition of channel filtering check boxes to the blend options panel.

 

post-57168-0-97935900-1496652011_thumb.png

 

Then you could selectively turn off channels without effecting other.

 

Thanks

 

Passive :)

Link to comment
Share on other sites

  • 2 months later...

Will a curves adjustment on the Red channel not do what you want?

 

balloons2.jpg

To save time I am currently using an automated AI to reply to some posts on this forum. If any of "my" posts are wrong or appear to be total b*ll*cks they are the ones generated by the AI. If correct they were probably mine. I apologise for any mistakes made by my AI - I'm sure it will improve with time.

Link to comment
Share on other sites

Hi carl123, thank you for the suggestion. Unfortunately, through trial and error I have come to the conclusion that the curves adjustment is different to advanced blending of channels (being able to turn of one, two or all channels on EACH layer/being able to apply channels to layers).

 

Please see this thread for exactly what I tried to do, using Curves and Channel mixers: https://forum.affinity.serif.com/index.php?/topic/46110-advanced-blending-of-channels-isolating-channels-on-layers/

 

In the end I realised I could not duplicate a Photoshop tutorial hence my +1 for this request. Please also see this thread for more on applying channels to layers: https://forum.affinity.serif.com/index.php?/topic/11258-please-help-things-i-cannot-do-with-affinity-photo

 

Here is Photoshop's Advanced Blending screen (including channels). You get to it by double clicking on a layer. Something like this in Affinity would be perfect. I love using Affinity Photo on my iPad Pro, but I really miss the advanced blending of channels from Photoshop. Here's hoping Affinity include it in a future release.

IMG_0186.GIF

Link to comment
Share on other sites

  • 2 years later...

Older request, but I also +1 this. Where it would be very useful is in reducing noise targeted to specific colour channels with both a NR filter and Guassian Blur filter.
I figured it would work just switching to the different channels under master but it doesn't. Say for example I want to affect the red channel only with a blur, and the shadows at that. I create a guassian blur, turn on the red channel preview so I am ONLY seeing red, when I switch to green and blue in the blend range and remove the guassian blur from those channels, it clearly still affects the red and it's as if I never added the adjustment in the first place. Not at all how one would expect the blend range tool to work when working in only one channel: If you choose Red in the blend range, Red should be unaffected by adjusting the blue and green channels.
There is a workaround but it takes a lot of time and effort to do: create greyscale representations of each colour channel, apply NR and blur to each one individually and then rebuild the colour, but blend range is SO CLOSE to doing this in one easy step.

 

FInd me at:

 

Facebook: https://www.facebook.com/GM-Photography-142947659079869/

 

Flickr: https://www.flickr.com/photos/gmphotography32/

 

or my personal website, not kept frequently up to date: www.gmphotography.ca

 

I use Affinity Photo, Lightroom, Panorama Maker 5, and Photomatix for my photography.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

Terms of Use | Privacy Policy | Guidelines | We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.