[Lua] Incorrect texture loading (probably, RGB as RGBA)

[Lepestronik]

Describe the bug
Some images used in Lua Universal Tools are loaded incorrectly. Presumably, this happens as a result of an attempt to load an image with an alpha channel, although the source file does not contain it (the pictures in the screenshots are in JPG format, similar errors were encountered when uploading RGB PNG).

Screenshots

This file loads correctly.

This file loads incorrectly.

Desktop:

• OS: Linux.
• Frontend: Qt.
• Version: 1.7.0.

[levinli303]

I created a script to render this image in center and did not meet with the issue

local function get_parent_path(item)
    return item:match("(.*[/\\])")
end

local script_dir = get_parent_path(celestia:getscriptpath())

celestia:overlay (10, 0, 0, 1.0, script_dir .. "image_Earth2.jpg")
wait (10)

[375gnu]

I'm neither not able to reproduce.