Improving the colour blending

[Magnymbus]

I noticed (quite recently) that when dealing with blending colours, the software must be using the lazy method that goes something like (PixelA+PixelB)/2. which is forgetting that computers essentially square root those colours (It's actually a Γ (Gamma) root), so you are making an average of a square root when it should be the square root of an average. The fix is to do (PixelA^Γ+PixelB^Γ)/2 where Γ (Gamma) is equal to somewhere between 1.8 and 2.2, depending on what took the image and what your monitor settings are. If there is an option for this already, I haven't been able to find it, but it really should be on by default, and it really shouldn't be without the proper mathematics. Minute Physics on Youtube recently made a really great video that explains this better than I did and it was that video that finally convinced me to do this. Anywho, here's a link to that: https://www.youtube.com/watch?v=LKnqECcg6Gw 

[toe_head2001]

There was some discussion about this over here: http://forums.getpaint.net/index.php?/topic/31654-blur-pixel-calculation-bug/

[Red ochre]

I've just experimented with the code for 'Gradients Galore' to test what happens if I raise the BGR values to a power, mix them, then take the root.
The difference seems to be that the mixed region is lighter for higher powers - but I don't see any advantage?. Red to green gives more yellow in the middle but for most colour combinations the transition colours are just a lighter version of those achieved at power 1.

As for the built-in blurs, many other effects depend upon them so they cannot be changed. If you wanted to write your own effect using this idea (gradient or blur) then do give codelab a try.http://forums.getpaint.net/index.php?/topic/880-codelab-for-advanced-users-v25-released-march-14-2015/

[carpetbagger]

I just found this topic so tried playing with CodeLab. On top is the Gaussian Blur, the bottom section is a custom blend which seems very different.

 

MyBlur.cs

[Ego Eram Reputo]

Blends and blurs are very different operations. I'm not surprised they are different.

 

I see this is your first post here, so first of all - welcome

 

I'd like to point out that this thread is a couple of years old. We like to avoid posting new comments on old threads. It keep the forum current

 

If you wish to restart the discussion on the differences between blending and blurring please start a new thread. Thanks!