a rather serious issue!!

[L-vinCent]

I encountered a rather serious issue. Using this JPG image and applying a simple filter with the following shader (which directly outputs the original image),

fragment half4 brightnessFragment(SingleInputVertexIO fragmentInput [[stage_in]],
                                  texture2d<half> inputTexture [[texture(0)]],
                                  constant BrightnessUniform& uniform [[ buffer(1) ]])
{
    constexpr sampler quadSampler;
    half4 color = inputTexture.sample(quadSampler, fragmentInput.textureCoordinate);
    
    return half4(color.rgb, 1.0);
}

the result should theoretically remain unchanged. However, the resulting image shows a noticeable decrease in saturation. Below are the original image and the resulting image.

[L-vinCent]

[L-vinCent]

resulting image.