ofSaveScreen() outputs file with wrong color

@cuinjune wrote:

Here’s my code:

void ofApp::draw(){
    ofSetColor(255, 0, 0);
    ofDrawRectangle(100, 100, 100, 100);
    ofSaveScreen("test.jpg");
    ofExit();
}

And here’s what the output image “test.jpg” looks like

test.jpg1024×768 5.88 KB

As you can see, the color of the rectangle is not red but blue.

Is this a bug? I tested this on macOS 10.14.4.

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Added: This issue also happens with ofSaveViewport().

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