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Alex_M

[APh] Burn and Dodge tools' Protect hue option not working?

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Hi,

 

It seems to me that the Protect hue option in the Burn and Dodge tools is not working. The result is identical no matter if it's on or off. For comparison, in Photoshop if I turn on this option there's a very clear difference in the result. So is it something with my settings in Affinity Photo or is it a bug? I use the latest official version of Photo.

 

Thanks in advance!


Affinity Photo 1.6.5.123 for Windows Windows 10 x64 1803  CPU AMD Threadripper 1950X @3.9 Ghz  RAM 32 GB GPU GTX 1080 ti 11GB NVMe SSD Samsung 960 Pro 512 GB

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I can see a very slight difference when comparing having the Protect Hue option enabled/disabled. I'll do some more testing and if needed pass it over to the developers to look into further.

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The results are not identical but since they affect only the hue component of color the difference may be hard to see. Using the Info panel in target sample mode shows the difference clearly:

5a8f383923430_hueprotect.png.9854323e06988327b2423c6c1dbbb140.png

In the image, the upper darkened part was made with one pass of the Burn Brush Tool with Protect Hue disabled; the lower one with exactly the same brush settings except with Protect Hue enabled. Comparing the H values in the Info panel with their corresponding numbered targets on the image shows that the hue component does not change if Protect Hue enabled, & does if it is not.


Affinity Photo 1.6.7 & Affinity Designer 1.6.1; macOS High Sierra 10.13.6 iMac (27-inch, Late 2012); 2.9GHz i5 CPU; NVIDIA GeForce GTX 660M; 8GB RAM
Affinity Photo 1.6.11.85 & Affinity Designer 1.6..4.45 for iPad; 6th Generation iPad 32 GB; Apple Pencil; iOS 12.1.1

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That's interesting but I don't really look at raw numbers when I work. To my eyes there is no perceivable difference. Photoshop, in comparison, you could definitely see a difference with the Protect option on and off.

 

And another issue. In Photo if I repeat the same spot several times with the Burn Brush and "Protect hue" option off, that spot becomes grey and lacking contrast. Doing the same in Photoshop makes the spot more contrasty and eventually black which is the effect that I need. Try it out and you'll see. So what really is the point of "Protect hue" if the end result would be pretty much the same visually (again, not talking about raw numbers)? And just to mention, I'm working on a brand new calibrated Eizo Color Edge monitor so the display is really accurate at showing colors and shades.


Affinity Photo 1.6.5.123 for Windows Windows 10 x64 1803  CPU AMD Threadripper 1950X @3.9 Ghz  RAM 32 GB GPU GTX 1080 ti 11GB NVMe SSD Samsung 960 Pro 512 GB

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Changing background colours and tonal ranges seems to have a huge effect on the effects of the dodge and burn brushes.

 

For what it's worth:

 

First image, on a single colour pixel layer, is the dodge brush, from top to bottom: 

Tonal range: Shadows, Protect Hue on, then Protect Hue off

Tonal range: Midtones, Protect Hue on, then Protect Hue off

Tonal range: Highlights: Protect Hue on, then Protect Hue off.

 

Comes out like this

 

5a948ad26ddb9_dodgebrush.thumb.jpg.30cdd0018f3b272c97769404ef9334f7.jpg

 

There are clear differences between the protection settings.

 

 

Now the same sequence with the burn brush:

 

5a948b1c39fc3_burnbrush.thumb.jpg.0a1b5c916f4cd55ba5a35754dc8ae55a.jpg

 

Again, pretty clear differences except perhaps in the highlights tonal range.

 

Same sequence, dodge brush, different base colour:

 

5a948d3556fb1_maroondodge.thumb.jpg.257b58a40c7327583e5f79c80af5a799.jpg

 

And with the burn brush:

 

5a948d33c5b0b_maroonburn.thumb.jpg.bc5c30984a56ac29e607948333172d73.jpg

 

In the two images with the maroon backgrounds, the differences between the protection on/off pairs are practically non-existent - perceptually and by the numbers.

 

But the differences in the next two are quite dramatic (dodge down the left, burn down the right), in the highlights and shadows if not in the midtones:

 

5a9497c35a599_browncomparison.thumb.jpg.59086ae143947fbbc14b7723a9ea0fb9.jpg

 

5a949ca363bb9_purpledodgeandburn.thumb.jpg.b96ae0fda06ac1069b8f75ebd77839a7.jpg

 

So it depends on all sorts of things: the underlying colours that are being dodged or burned, the tonal range that the tool is working on, probably more.

 

It's all in the algorithms... 

 

But maybe try different tonal ranges as well as protect on/off.

 

 

 


Affinity Photo 1.6.7, Affinity Designer 1.6.1

Various betas

macOS 10.14

MacBook Air

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