Modify part of the photo color using GIMP

Modify the color of the photo part of GIMP-Linux general technology-Linux technology and application information. The following is a detailed description. The test was completed yesterday. It should be easy this month. The GIMP tutorial to be written has not been updated for a long time. Sorry, you can't help it. I just updated it today. I don't know what to write. Basically, they all need to be used, so I also need to write a little bit. If you have any need to modify the image, please let me know and I will see if there is any better solution to help you.

First, let's take a look at the comparison before and after processing.
Before processing

After processing

First, let's analyze it. I plan to highlight the red clouds in the background when taking a photo. The final effect is not only that the clouds are not as red as the scenes, but also that the foreground is very dark, so we need to make the clouds more red, at the same time, make my face brighter. It's ugly.

1. After opening the image with GIMP, select the last "select tool by color" in the first line of the Toolbox and adjust the threshold continuously, after you click the Red Cloud, you can select most of the Red areas.

2. In the menu bar-color-level tool, open the "Adjust color level" dialog box, select "red" for the channel, and move the Middle triangle slider under "output level, change to the desired color.

3. After adjustment, click "select" on the menu bar to select the unspecified part. In the same menu bar, click "color" and select "brightness" on the channel ", adjust to the appropriate brightness.


The final output result is clear.