Color and Luminosity Blending Modes

I did more testing, but with one layer that was nothing but white, another that was nothing but color. The result was the same. And now I'm wondering if you made these modes preserve color over white because it might be useful. If so, maybe a "preserve white" switch can be added so we can control the behavior.

It looks like the HLS route gets me so close to what it should look like I would not notice the difference except for a side by side comparison. So this should work. Thanks for the suggestion.

Are there any other blending modes (besides Color and Luminosity) that don't work as expected.

Interesting. I didn't fully notice this until you mentioned it, and now it's bugging me -- as I've made many personal filters with FF's color/luminosity blend, thinking it did what my PSP (legacy) color/luminosity blend does.
I guess FF is using the HSY color model ( -- that model just seems unpredictable to my mind).
I'm glad to learn about the HLS Assemble alternative. (I'm guessing the HSB Assemble route might be even closer to PS's color/luminosity blends -- as I think that's the color model PS uses...(?))

I did some tests and the results were different from what I expected.

From what I've found, I think the Assemble HLS component seems to work best -- where the "trick" seems to be in finding a good luminance image for the L input. The Y from the Extract HSY component seems to be the closest I could come up with. But it's luminance seems to be off a bit... (I'm thinking somehow it could be adjusted to be even closer to what PS's color blend makes.)

Attached is a filter that I made to help try and find a close PS Color blend. With the filter I'm just trying to adjust the extracted Y channel so that I can find a "better" color blend. (Basically, I'm comparing the results I get from it to the results I get in PS when I use a flat color layer as a color blend above some original image...)
It may be of no use to anyone but me, but I'll post it here anyway.





colorblendtool.ffxml

Interesting, but I was just tracing backward in my filter and I was reminded that I used Color blending mode early in the chain. IOW, I was taking advantage of the different way it works, and if they "fixed" it, it would hurt my filter. Maybe hurt others.

So I hope that if they do change it, they also allow for the current method too.

Any comment from Filter Forge staff on this?

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Andrew B. wrote: and if they "fixed" it, it would hurt my filter

When we change the algorithm of a component, we always add a new version of the component. The old version (the one used in existing filters) is always left intact. This way we can fix components, change the way they work and introduce new functionality without breaking existing filters.

If you need an old version of a particular component for a newly-created filter, it can be found in the Obsolete category on the Component Bar (you can enable this in Tools > Options).

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Vladimir Golovin wrote: If you need an old version of a particular component for a newly-created filter, it can be found in the Obsolete category on the Component Bar (you can enable this in Tools > Options).

Great feature!