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    What I know, "alpha" slider works with both "Filter Active" and
    "Mask Selection" checkboxes checked.<br>
    The "Filter Active" checkbox enables the options: red, green, blue,
    hue, saturation, value, fade, <b>alpha</b>.<br>
    If "Mask Selection" is not checked "alpha" will not work.<br>
    <br>
    Take a look at the video "Cin_BluBanana-alpha", please:<br>
    <a class="moz-txt-link-freetext" href="https://files.fm/u/d3t4uf3kyc">https://files.fm/u/d3t4uf3kyc</a><br>
    <br>
    IgorBeg<br>
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