How can I mask the sky in this photo?

[yasuo (Ohnishi, Yasuo)]

Using my relative color area collection CTL script and Area mask.

PXL_20241229_083121489.NIGHT.RAW-02.ORIGINAL.dng.arp (12.6 KB)

You can download this CTL script from the link below.

Relative Color Area Collection tool (ex-"Color Cast Correction tool") for ART with CTL

I have created internationalized versions of these scripts. You can download them from the link below. And I prepared language files for them. They contain Alberto’s original CTL script descriptions and descriptions for my scripts. The translated descriptions for my scripts are made with DeepL, if I don’t know the description language. So I can’t guarantee the accuracy of the translations. You have to copy them to the ctlscrpts/languages directory in your personal settings directory for ART…

The color area selection method of my scripts is different from other color selection tools. Its explanation of basic logic is in the link below.

CTL Script: "Relative Color Filter for WB and primaries correction"

Yes. However, I needed a color selection tool (mask) based on a completely different method. My starting point is editing to remove uneven color cast across different hue regions from film scanned images. Normal (uniform) color casts are generally easy to remove using existing image editing software. However, it is very difficult to remove uneven color casts across different hue regions like following image. You can see uneven yellow cast in the image. [3-Fig5] Figure 1 Uneven yellow cas…

There is also Japanese explanation.

既存の写真編集ソフトだけでは黄変ネガ写真画像の補正が困難な理由 - 省型旧形国電の残影を求めて