RFC: new event after preset or style has been applied

[deekayhd]

I am thinking about a way to trigger some actions after a style has been applied., Typical examples would be:

• rotate and perspective: analyze line structure and correct
• AgX: auto tune levels
• Filmic: Auto tune levels
• ...

My current idea is to execute a Lua script after a style (or maybe preset) has been applied. However, to my knowledge this would need a new event. There is already an event DT_SIGNAL_PRESET_APPLIED, but it is not exposed to Lua scripts. I could not find any similar event for styles.

@wpferguson What is your opinion?

[wpferguson]

What is your opinion?

Think bigger. 😁

You're thinking is

• style -> script
• preset -> script

but the better way is

script shortcut which "evaluates" the image then

• applies a style
• enables/disables modules based on "evaluation"
• adjusts modules using presets
• adjusts individual module controls as necessary

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Here's what I do...

I shoot sports and portraits so I have a style for each. I also have a general purpose style. The sports style has multiple module instances configured with presets, that are turned off by default.

I cull selecting the images I want. As I pick an image I also assign processing tags such as backlit, over exposed, under exposed, high contrast, low contrast, etc. If the sport was outdoors I assign weather conditions (the script defaults to clear, so I just have to assign if different).

My folder path names will have what sport, the visiting team, and the home team, or portrait, or none of the previous which gets categorized as general.

When I load an image in darkroom the following happens

• the path gets evaluated and the appropriate style applied
• the processing tags and weather tags are used to lookup processing presets in a table and the modules are enabled and the presets are applied.
• If it's an outdoor event I calculate the sunrise and sunset times so that I can then figure out blue hour, golden hour, etc and adjust the modules accordingly.
• If it's an indoor event I apply the color calibration preset corresponding with the venue
• I check the lens camera combination and apply the necessary lens correction.
• I read the pitch and roll data and correct the image tilt.

Then I do adjustments to taste crop/expsosure/etc.

Then I have a shortcut that applies all the "heavy hitters"

• denoise profiled based on camera and ISO
• DorS local contrast, AA sharpening, and denoise depending on ISO
• I increase DorS AA sharpening depending on camera and lens
• A final contrast adjustment based on processing tags/environmental conditions

As a last step AgX is automatically focused so I can make any final adjustments.

Then I move to the next image and the thumbnail of the just processed image is updated in background so that when I return to lighttable I don't have to wait for all the thumbnails to update.

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Before my camera had pitch and roll data, I automated the rotate and perspective correction using the verticals. It mostly worked, though a couple of times I had to reset and do it by hand.